Performance information

• Braiding Operations for a Topological Josephson Junction Array Using a Bipolar Current Pulse Generator Controlled by SFQ Logic Circuits
  Hiroaki Myoren; Takuro Funazawa; Kitaru Oba; Yuki Shimizu; Masato Naruse
  IEEE Transactions on Applied Superconductivity, Volume：34, Number：3, First page：1, Last page：6, May 2024, [Reviewed]
  Institute of Electrical and Electronics Engineers (IEEE), Scientific journal
  DOI：https://doi.org/10.1109/tasc.2024.3372865
  DOI ID：10.1109/tasc.2024.3372865, ISSN：1051-8223, eISSN：1558-2515
• Braiding Operations for a Topological Josephson Junction Array using SFQ Current Pulses
  Takuro Funazawa; Masato Naruse; Hiroaki Myoren
  Journal of Physics: Conference Series, Volume：2323, Number：1, First page：012035, Last page：012035, Aug. 2022, [Reviewed]
  Abstract
  
  Majorana bound states (MBSs) can occur in topological Josephson junction (JJ) arrays with the presence of a fractional vortex with 2π-phase winding. It has been theoretically shown that the braiding operation can be achieved by using current pulses, compatible with single flux quantum (SFQ) technology. Therefore, we designed an SFQ logic circuit for the braiding operations of the topological JJ array using single flux quanta in a conventional JJ array. Braiding operations could be realized by an SFQ logic circuit with double flux quantum driver. To obtain positive and negative current pulses using the SFQ logic circuit, we used SFQ logic circuits with ac biasing for simulation. Finally, we confirmed the CNOT operation using an array-type SFQ circuit by means of simulation and estimated the CNOT operation speed.
  IOP Publishing, Scientific journal
  DOI：https://doi.org/10.1088/1742-6596/2323/1/012035
  DOI ID：10.1088/1742-6596/2323/1/012035, ISSN：1742-6588, eISSN：1742-6596
• Planarized Nb 4-Layer Fabrication Process for Superconducting Integrated Circuits and Its Fabricated Device Evaluation
  Shuichi NAGASAWA; Masamitsu TANAKA; Naoki TAKEUCHI; Yuki YAMANASHI; Shigeyuki MIYAJIMA; Fumihiro CHINA; Taiki YAMAE; Koki YAMAZAKI; Yuta SOMEI; Naonori SEGA; Yoshinao MIZUGAKI; Hiroaki MYOREN; Hirotaka TERAI; Mutsuo HIDAKA; Nobuyuki YOSHIKAWA; Akira FUJIMAKI
  IEICE Transactions on Electronics, Volume：E104-C,9, First page：435, Last page：445, 2021, [Reviewed]
  Institute of Electronics, Information and Communications Engineers (IEICE), Scientific journal
  DOI：https://doi.org/10.1587/transele.2020sup0001
  DOI ID：10.1587/transele.2020sup0001, ISSN：0916-8524, eISSN：1745-1353
• Development of embedded STJ for large format array X-ray detector
  Y. Ito; M. Aoyagi; C. Otani; M. Naruse; H. Myoren; T. Taino
  Journal of Physics: Conference Series, Volume：1590, Number：1, First page：012035, Last page：012035, Jul. 2020, [Reviewed]
  We have been developing an embedded superconducting tunnel junction (e-STJ) for a large-format array X-ray detector. Compared with the conventional STJ array, the e-STJ array is suitable for enlarging the detection area effectively because the e-STJ detector utilizes a three-dimensional packaging technology. To investigate the relationship between the fabrication method and the electric characteristics of the e-STJ, we designed and fabricated three types of simplified e-STJ and measured their subgap leakage current in the temperature range from 4.2 K to 0.3 K. We found that the roughness of the embedding hole on the Si substrate and the contact part between the embedded STJ and the side of the embedding hole affected the subgap leakage current.
  Institute of Physics Publishing, English, International conference proceedings
  DOI：https://doi.org/10.1088/1742-6596/1590/1/012035
  DOI ID：10.1088/1742-6596/1590/1/012035, ISSN：1742-6596, eISSN：1742-6596, SCOPUS ID：85090054199
• Superconducting Resonators with Niobium and $${\mathrm{YBa}_{2}\mathrm{Cu}_{3}O_{7-{\delta } } }$$ for Alpha-Particle Detectors
  M. Naruse; T. Ando; Y. Waga; R. Kubota; S. Mima; C. Otani; T. Taino; H. Myoren
  Journal of Low Temperature Physics, Volume：199, Number：3-4, First page：614, Last page：621, May 2020, [Reviewed]
  Springer Science and Business Media LLC, Scientific journal
  DOI：https://doi.org/10.1007/s10909-020-02373-x
  DOI ID：10.1007/s10909-020-02373-x, ISSN：0022-2291, eISSN：1573-7357
• Niobium-Based Kinetic Inductance Detectors for High-Energy Applications　　　　　　　　　　　　　　　
  Masato Naruse; Masahiro Kuwata; Tomohiko Ando; Yuki Waga; Tohru Taino; Hiroaki Myoren
  IEICE TRANSACTIONS ON ELECTRONICS, Volume：E103C, Number：5, First page：204, Last page：211, May 2020, [Reviewed]
  A lumped element kinetic inductance detector (LeKID) relying on a superconducting resonator is a promising candidate for sensing high energy particles such as neutrinos, X-rays, gamma-rays, alpha particles, and the particles found in the dark matter owing to its large-format capability and high sensitivity. To develop a high energy camera, we formulated design rules based on the experimental results from niobium (Nb)-based LeKIDs at 1 K irradiated with alpha-particles of 5.49 MeV. We defined the design rules using the electromagnetic simulations for minimizing the crosstalk. The neighboring pixels were fixed at 150 mu m with a frequency separation of 250 MHz from each other to reduce the crosstalk signal as low as the amplifier-limited noise level. We examined the characteristics of the Nb-based resonators, where the signal decay time was controlled in the range of 0.5-50 mu s by changing the designed quality factor of the detectors. The amplifier noise was observed to restrict the performance of our device, as expected. We improved the energy resolution by reducing the filling factor of inductor lines. The best energy resolution of 26 for the alpha particle of 5.49 MeV was observed in our device.
  IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, English, Scientific journal
  DOI：https://doi.org/10.1587/transele.2019SEI0001
  DOI ID：10.1587/transele.2019SEI0001, ISSN：1745-1353, Web of Science ID：WOS:000530666500003
• Josephson Effect and Charge Distribution in Thin Bi₂Te₃ Topological Insulators
  Martin P. Stehno; Prosper Ngabonziza; Hiroaki Myoren; Alexander Brinkman
  Advanced Materials, Volume：32, Number：14, Feb. 2020, [Reviewed]
  Abstract
  
  Thin layers of topological insulator materials are quasi‐2D systems featuring a complex interplay between quantum confinement and topological band structure. To understand the role of the spatial distribution of carriers in electrical transport, the Josephson effect, magnetotransport, and weak anti‐localization are studied in bottom‐gated thin Bi₂Te₃ topological insulator films. The experimental carrier densities are compared to a model based on the solutions of the self‐consistent Schrödinger–Poisson equations and they are in excellent agreement. The modeling allows for a quantitative interpretation of the weak antilocalization correction to the conduction and of the critical current of Josephson junctions with weak links made from such films without any ad hoc assumptions.
  Wiley, Scientific journal
  DOI：https://doi.org/10.1002/adma.201908351
  DOI ID：10.1002/adma.201908351, ISSN：0935-9648, eISSN：1521-4095
• Performance of Digital SQUID with Sub-Flux Quantum Feedback Resolution Fabricated using 10 kA/cm2 Nb Process.　　　　　　　　　　　　　　　
  Itagaki, K., Oshima, I., Hasegawa, Y., Matsunawa, R., Naruse, M., Taino, T., & Myoren, H.
  Journal of Physics: Conference Series, Volume：1590,1, First page：012038, 2020, [Reviewed]
• Implementation of Interface Circuit for Digital SQUID with Sub-Flux Quantum Feedback Resolution.　　　　　　　　　　　　　　　
  Matsunawa, R., Itagaki, K., Oshima, I., Hasegawa, Y., Naruse, M., Taino, T., & Myoren, H.
  Journal of Physics: Conference Series, Volume：1590,1, First page：012039, 2020, [Reviewed]
• High-Resolution Digital SQUID Magnetometer using Sub-Flux Quantum Feedback　　　　　　　　　　　　　　　
  Hiroaki Myoren; Kosuke Okabe; Ryo Matsunawa; Kohki Itagaki; Masato Naruse; Tohru Taino
  14TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS2019), Volume：1559, First page：012013., 2020, [Reviewed]
  Digital SQUIDs with the single flux quantum (SFQ) feedback have attracted much attention because of the feasibility of realizing a wide dynamic range and high slew rate for digital magnetometers. In order to realize higher resolution, we have studied a digital SQUID with sub-flux quantum feedback. Combining the sub-flux quantum feedback to a feedback loop and the direct SFQ feedback to a main loop triggered by carry SFQ pulses from an up/down counter. In this study, we discuss the method of multi-flux quantum generation and compact design of the SFQ up/down counter for high-speed operation of the digital SQUID magnetometer.
  IOP PUBLISHING LTD, English, International conference proceedings
  DOI：https://doi.org/10.1088/1742-6596/1559/1/012013
  DOI ID：10.1088/1742-6596/1559/1/012013, ISSN：1742-6588, eISSN：1742-6596, Web of Science ID：WOS:000558737600013
• Development of High Throughput X-ray detectors using Superconducting Tunnel Junctions with a large area size
  Y Fujisawa; G Fujii; M Ukibe; S Shiki; M Naruse; H Myoren; T Taino
  Journal of Physics: Conference Series, Volume：1293, Number：1, First page：012052, Last page：012052, Sep. 2019, [Reviewed]
  IOP Publishing, Scientific journal
  DOI：https://doi.org/10.1088/1742-6596/1293/1/012052
  DOI ID：10.1088/1742-6596/1293/1/012052, ISSN：1742-6588, eISSN：1742-6596
• Design of Digital Filter for Digital SQUID With Sub-Flux Quantum Feedback Resolution　　　　　　　　　　　　　　　
  Hiroaki Myoren; Kousuke Okabe; Ryo Matsunawa; Masato Naruse; Tohru Taino
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：29, Number：5, First page：Art no. 1303004, Last page：4, Aug. 2019, [Reviewed]
  Digital SQUIDs with the single flux quantum (SFQ) feedback have attracted much attention because of the feasibility of realizing a wide dynamic range and high slew rate. In order to realize higher resolution, we have studied the performance of an advanced, digital SQUID configuration offering sub-flux quantum feedback. Combining the sub-flux quantum feedback to a feedback loop and the direct SFQ feedback to a main loop triggered by carry SFQ pulses from an up/down counter. After optimization of the circuit, we confirmed the maximum magnetic field amplitude exceed 1 mu T, the magnetic field noise is lower than 100 pT/root Hz with a signal band frequency of 1.22 MHz. Using a first-order sinc filter, we could implement the digital SQUID magnetometer at low-temperature with reasonable noise reduction performance and the binary data rate reduction in order to transfer the data from low temperature circuit to the room temperature electronics.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2019.2908625
  DOI ID：10.1109/TASC.2019.2908625, ISSN：1051-8223, eISSN：1558-2515, Web of Science ID：WOS:000467071300001
• High Sensitivity Photon Sensors Relying on Superconducting Micro Resonators
  Masato NARUSE; Tomohiko ANDO; Ritsuki KUBOTA; Masahiro KUWATA; Tohru TAINO; Hiroaki MYOREN
  TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan), Volume：54, Number：3, First page：174, Last page：180, May 2019, [Reviewed]
  Cryogenic Association of Japan, Scientific journal
  DOI：https://doi.org/10.2221/jcsj.54.174
  DOI ID：10.2221/jcsj.54.174, ISSN：0389-2441, eISSN：1880-0408
• 超伝導共振器を用いた超高感度光子センサー ―ミリ波からガンマ線まで―　　　　　　　　　　　　　　　
  成瀬 雅人, 安藤 友彦, 久保田 立記, 桑田 正博, 田井野 徹, 明連 広昭
  低温工学, Volume：54, First page：174, Last page：180, 2019, [Reviewed]
• Readout Circuit Based on Single-Flux-Quantum Logic Circuit for Photon-Number-Resolving SNSPD Array　　　　　　　　　　　　　　　
  Hiroaki Myoren; Satoshi Denda; Kazuki Ota; Masato Naruse; Tohru Taino; Lin Kang; Jian Chen; Peiheng Wu
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：28, Number：4, First page：Art.No. 2500304, Jun. 2018, [Reviewed]
  A read-out circuit for photon-number-resolving superconducting nanowire single-photon detector (SNSPD) based on the single-flux-quantum (SFQ) circuit was designed and the basic performance of the fabricated circuit was confirmed. The current pulse output from an SNSPD array was converted to a SFQ pulse. The SFQ pulse triggered two stacks of double-flux-quantum (DFQ) amplifiers. A single block of a 40-series DFQ amplifier (DFQA) generated 2.3-mV voltage with a rising time of 400 ps for an operation frequency of 1.25 GHz, and the two stacks of DFQA generated 4.6-mV voltage when the SFQ pulse trains supplied both the DFQAs. The total voltage generated by twelve-series of 40-series DFQAs was expected to be 27.6 mV, with the same rising time of 400 ps. Using the fabricated circuit, the 40-series DFQA and the two stacks of the 40-series DFQA generated 2.3- and 4.6-mV voltage, respectively. The output voltage of the SFQ readout circuit was compatible to a room-temperature photon counter with a wide-band low-noise amplifier operating at low temperature.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2018.2809483
  DOI ID：10.1109/TASC.2018.2809483, ISSN：1051-8223, eISSN：1558-2515, Web of Science ID：WOS:000431524600001
• Absorber-coupled lumped element kinetic inductance detectors for gamma-rays　　　　　　　　　　　　　　　
  Masato Naruse; Noriaki Miyamoto; Tohru Taino; Hiroaki Myoren
  PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, Volume：541, First page：36, Last page：39, Oct. 2017, [Reviewed]
  We propose gamma-ray detectors based on superconducting resonators that can be largely multiplexed and show potential for quick response time, high spatial resolution, and high energy resolution. The resonators were fabricated with a niobium film on a silicon wafer. Eight out of ten detectors could be operated at 0.3 K. The detectors were coupled to a 2-mm-thick lead absorber and examined with a cesium 137 source. The pulse decay time was 3.6 mu s and energy resolution was 3.8 keV at 662 keV. We also describe the resonant properties of each detector. The proposed detectors are suitable for use as food-screening systems. (C) 2017 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE BV, English, Scientific journal
  DOI：https://doi.org/10.1016/j.physc.2017.08.001
  DOI ID：10.1016/j.physc.2017.08.001, ISSN：0921-4534, eISSN：1873-2143, Web of Science ID：WOS:000410647600006
• Improving the spatial resolution of superconducting tunnel junction THz wave detectors using a modified LiNbO3 absorber　　　　　　　　　　　　　　　
  M. Sone; N. Igarashi; M. Naruse; H. Myoren; Y. Sasaki; C. Otani; T. Taino
  Journal of Physics: Conference Series, Volume：871, Number：1, First page：012069, Jul. 2017, [Reviewed]
  We proposed a superconducting tunnel junction (STJ) detector for terahertz (THz) waves with a modified substrate absorber. The absorber of each STJ was isolated by trenches in order to restrict the diffusion of phonons generated by THz waves, which are made with a dicing process. We evaluated the diffusion characteristics of phonons in the LiNbO3 substrate by detecting THz photons. We found that the phonon diffusion length in a 500-μm-thick LiNbO3 substrate was over 1 mm. No degradation of the current - voltage (I-V) characteristics of the STJ after performing the dicing process.
  Institute of Physics Publishing, English, International conference proceedings
  DOI：https://doi.org/10.1088/1742-6596/871/1/012069
  DOI ID：10.1088/1742-6596/871/1/012069, ISSN：1742-6596, SCOPUS ID：85028005068
• Development of STJ for neutron detector on Si-LBO hybrid substrate by surface-activated room-temperature bonding
  S. Endo; G. Fujii; M. Ukibe; H. Takagi; M. Ohkubo; M. Naruse; H. Myoren; C. Otani; T. Taino
  Journal of Physics: Conference Series, Volume：871, Number：1, First page：012070, Jul. 2017, [Reviewed]
  We have been developing superconducting tunnel junctions (STJs) for neutron detector on a Si-Li2B4O7 (LBO) hybrid substrate. An active area of each STJ was limited by dicing in order to obtain high spatial resolution. The Si-LBO hybrid substrate was bonded by a surface-activated room-temperature bonding. In this bonding method, the Si and LBO surfaces were sputter-etched by high energy Ar ion beam and bonded in a vacuum. We fabricated STJs on the Si-LBO hybrid substrate and measured their current-voltage characteristic. Their leakage currents (Ileak) were <
  10 nA, and so we succeeded in fabricating STJs on the Si-LBO hybrid substrate, which can be expected to operate as neutron detectors with high performance.
  Institute of Physics Publishing, English, International conference proceedings
  DOI：https://doi.org/10.1088/1742-6596/871/1/012070
  DOI ID：10.1088/1742-6596/871/1/012070, ISSN：1742-6596, ORCID：44982367, SCOPUS ID：85027976830
• Phase-Slip Phenomena in Proximitized NbN/NiCu Superconducting Nanostripes
  L. Parlato; M. Ejrnaes; R. Cristiano; H. Myoren; G. P. Pepe
  Journal of Superconductivity and Novel Magnetism, Volume：30, Number：12, First page：3403, Last page：3407, Jul. 2017, [Reviewed]
  Springer Science and Business Media LLC, Scientific journal
  DOI：https://doi.org/10.1007/s10948-017-4247-6
  DOI ID：10.1007/s10948-017-4247-6, ISSN：1557-1939, eISSN：1557-1947
• Noise Properties of Digital SQUID Using Double Relaxation Oscillation SQUID Comparator With Relaxation Oscillation Resonant Circuit　　　　　　　　　　　　　　　
  Hiroaki Myoren; Ryota Kobayashi; Kenji Kumagai; Masato Naruse; Tohru Taino
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：27, Number：4, First page：2677422, Jun. 2017, [Reviewed]
  We designed a digital superconducting quantum interference device (SQUID) system that contains a double relaxation oscillation SQUID (DROS) as a magnetic flux comparator that is connected to an additional relaxation oscillation (RO) circuit with mutually coupled inductances. In the designed digital SQUID, the RO circuit works as a resonator and increases the relaxation oscillation frequency without decreasing the input current of dc/SFQ converters. Numerical simulation shows that the digital SQUID system can operate up to 7 GHz. A fabricated digital SQUID using a DROS comparator with an RO circuit provides correct digital SQUID operation. For a magnetometer using the digital SQUID system, we can realize a magnetic field noise less than 1 pT/root Hz with a small signal bandwidth of more than 10 MHz.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2017.2677422
  DOI ID：10.1109/TASC.2017.2677422, ISSN：1051-8223, eISSN：1558-2515, Web of Science ID：WOS:000399937400001
• Investigation of dark counts in innovative materials for superconducting nanowire single-photon detector applications　　　　　　　　　　　　　　　
  L. Parlato; M. Ejrnaes; U. Nasti; R. Arpaia; T. Taino; T. Bauch; H. Myoren; Roman Sobolewski; F. Tafuri; F. Lombardi; R. Cristiano; G. Pepe
  SPIE Proceedings, Volume：10229, First page：102290I, Last page：102290I, May 2017
  SPIE, International conference proceedings
  DOI：https://doi.org/10.1117/12.2267647
  DOI ID：10.1117/12.2267647, ISSN：0277-786X
• Fabrication of superconducting tunnel junctions with embedded coil for applying magnetic field　　　　　　　　　　　　　　　
  Kenji Yamaguchi; Hiroshi Nakagawa; Masahiro Aoyagi; Masato Naruse; Hiroaki Myoren; Tohru Taino
  PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, Volume：530, First page：90, Last page：92, Nov. 2016, [Reviewed]
  We have proposed and demonstrated a superconducting tunnel junction (STJ) with an embedded coil for applying a magnetic field. The STJ was fabricated on the coil, which was embedded in a Si substrate. The coil in the Si substrate consists of superconducting microstrip lines and applies a magnetic field to the STJ to suppress the dc Josephson current. The embedded coil was designed with a line and space of 3 mu m and a thickness of 120 nm. To planarize the coil, we employed chemical mechanical polishing (CMP) in our fabrication process. In this STJ, the maximum current of the embedded coil was 28 mA, which corresponded to the maximum magnetic field of 11.76 mT. (C) 2016 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE BV, English, Scientific journal
  DOI：https://doi.org/10.1016/j.physc.2016.03.010
  DOI ID：10.1016/j.physc.2016.03.010, ISSN：0921-4534, eISSN：1873-2143, Web of Science ID：WOS:000389518400027
• Fabrication of TiN/AlN/TiN tunnel junctions　　　　　　　　　　　　　　　
  Takeru Nakayama; Masato Naruse; Hiroaki Myoren; Tohru Taino
  PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, Volume：530, First page：87, Last page：89, Nov. 2016, [Reviewed]
  We have fabricated TiN/AlN/TiN tunnel junctions with an epitaxial layer. The critical temperature of TiN can be changed in the range from 0.5 to 5.0 K. Therefore, it is easy to set 5.0 K as the target critical temperature. When a Superconducting Tunnel Junction (STJ) is operated as a photon detector, it is necessary to cool it to within 0.1 K of the critical temperature in consideration of the noise of the thermally stimulated currents. Because 0.3 K was desirable, as for the manufacture of general purpose photon detectors, the critical temperature 5.0 K. TiN and AlN films were deposited by dc and rf magnetron sputtering in a load-lock sputtering system at ambient substrate temperatures. The junctions have a gap voltage of V-g = 1.1 mV, and critical current density of J(c) = 0.24 A/cm(2), and R-sg/R-n of 7.2, and low subgap leakage current (I-sub@ 500 mu V = 180 nA). We report our experiment system, the manufacture method and the junction properties in this paper. (C) 2016 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE BV, English, Scientific journal
  DOI：https://doi.org/10.1016/j.physc.2016.04.005
  DOI ID：10.1016/j.physc.2016.04.005, ISSN：0921-4534, eISSN：1873-2143, Web of Science ID：WOS:000389518400026
• Design and Magnetic Field Noise of Magnetometer Using Digital SQUID With Subflux Quantum Feedback　　　　　　　　　　　　　　　
  Hiroaki Myoren; Kouhei Takatoku; Masato Naruse; Tohru Taino
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：26, Number：5, First page：7473925, Aug. 2016, [Reviewed]
  Digital superconducting quantum interference devices (SQUIDs) based on single-flux quantum (SFQ) logic have attractive characteristics such as wide dynamic ranges and high slew rates. However, the resolution of a typical digital SQUID is limited by SFQ feedback. To realize lower magnetic field noise by magnetometers using digital SQUIDs, we have adopted two feedback combinations: one, utilizing the SFQ input/output for a main loop and the other, using a mutually coupled loop. The main loop receives direct Phi(0) feedback and subflux quantum feedback Phi(0)/n, where n is an integer from the mutually coupled loop. The flux resolution for the digital SQUID shows improvement with increasing n and reaches below 40 m Phi(0) at n = 2(10); however, the slew rate decreases with increasing n and reaches 1.22 x 10(6)Phi(0)/s at f(c) = 1.25 GHz and n = 2(10). For amagnetometer using a digital SQUID with a pickup loop, we confirmed a magnetic field noise of less than 100 fT/root Hz with a signal bandwidth of 1 MHz for operation frequency f(c) of 20 GHz.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2016.2569500
  DOI ID：10.1109/TASC.2016.2569500, ISSN：1051-8223, eISSN：1558-2515, Web of Science ID：WOS:000380321300001
• Gate-Tunable Transport Properties of In Situ Capped Bi2Te3 Topological Insulator Thin Films　　　　　　　　　　　　　　　
  Prosper Ngabonziza; Martin P. Stehno; Hiroaki Myoren; Viola A. Neumann; Gertjan Koster; Alexander Brinkman
  ADVANCED ELECTRONIC MATERIALS, Volume：2, Number：8, Aug. 2016, [Reviewed]
  Combining of the ability to prepare high-quality, intrinsic Bi2Te3 topological insulator thin films of low carrier density with in situ protective capping, a pronounced, gate-tunable change in transport properties of Bi2Te3 thin films is demonstrated. Using a back gate, the carrier density is tuned by a factor of approximate to 7 in an Al2O3 capped Bi2Te3 sample and by a factor of approximate to 2 in Te capped Bi2Te3 films. Full depletion of bulk carriers is achieved, which allows access to the topological transport regime dominated by surface state conduction. When the Fermi level is placed in the bulk band gap, the presence of two coherent conduction channels associated with the two decoupled surfaces is observed. The magnetotransport results show that the combination of capping layers and electrostatic tuning of the Fermi level provide a technological platform to investigate the topological properties of surface states in transport experiments and pave the way toward the implementation of a variety of topological quantum devices.
  WILEY-BLACKWELL, English, Scientific journal
  DOI：https://doi.org/10.1002/aelm.201600157
  DOI ID：10.1002/aelm.201600157, ISSN：2199-160X, Web of Science ID：WOS:000384454800010
• Superconductor/Ferromagnet Nanowires for Optical Photon Detection　　　　　　　　　　　　　　　
  R. Cristiano; L. Parlato; U. Nasti; M. Ejrnaes; H. Myoren; T. Taino; R. Sobolewski; G. P. Pepe
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：26, Number：3, First page：1, Last page：4, Apr. 2016, [Reviewed]
  During the last decade, research on nanowires as superconducting single-photon detectors (SNSPDs or SSPDs) has gained interest due to many experiments demonstrating their fascinating potentialities in several fields. The search for more appealing materials for SNSPDs is presently a hot topic. Several superconductors have been proposed as possible alternatives to NbN, which is presently the racehorse. Examples are WSi and MoSi, which have advantages such as amorphous morphology and narrow-gap and low quasi-particle diffusivity, which permits extending the application in the mid- and far-IR ranges. A strategy based on material hybridization of superconductors with ferromagnets can open a new direction in the development of SNSPD. We present results concerning the hybrid superconducting/ferromagnetic (S/F) single nanowires for SNSPDs. Experiments under laser illumination show a single-photon response of S/Fbased nanowires. The ferromagnetic overlayer has the beneficial effect of an increase of the superconducting critical current density and a decrease of dark counts. We compare dark counts in hybrid S/F with pure S nanowires. The experimental results are explained in terms of the existing models based on the presence of magnetic vortices.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2016.2521579
  DOI ID：10.1109/TASC.2016.2521579, ISSN：1051-8223, eISSN：1558-2515, Web of Science ID：WOS:000372782800001
• Dual-Double Slot Antennas Fabricated with Single Superconducting Film for Millimeter Wave Camera　　　　　　　　　　　　　　　
  Masato Naruse; Tom Nitta; Kenichi Karatsu; Msakazu Sekine; Shigeyuki Sekiguchi; Yutaro Sekimoto; Takashi Noguchi; Tohru Taino; Hiroaki Myoren
  JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES, Volume：37, Number：2, First page：128, Last page：136, Feb. 2016, [Reviewed]
  We propose an entirely plane-structure camera for millimeter wave astronomy, in order to reduce production cost and time. The camera is composed of a silicon lens-let, antennas, feed lines, and detectors made from the same superconducting aluminum film on a silicon substrate. A couple of double-slot antennas are located the same focal plane of a small substrate lens to enhance the packing density of detectors and observation efficiency. To achieve high sensitivity, we adapted a microwave kinetic inductance detector as a photon sensor, which consists of a superconducting microresonator. We examined the optical performance of the camera attached to a silicon lens array at 220 GHz in a 0.3 K cryostat. The measured beams were in good agreement with the calculations within the dynamic range of the setup (20 dB). Polarization misalignments between the dual-double slot antenna were less than 2(a similar to), and cross-polarization level was around -7 dB. The relatively high cross-polarization would be explained by an antenna crosstalk mediated by quasiparticle diffusion.
  SPRINGER, English, Scientific journal
  DOI：https://doi.org/10.1007/s10762-015-0216-y
  DOI ID：10.1007/s10762-015-0216-y, ISSN：1866-6892, eISSN：1866-6906, Web of Science ID：WOS:000368053700002
• Thermal fluctuations in superconductor/ferromagnet nanostripes　　　　　　　　　　　　　　　
  U. Nasti; L. Parlato; M. Ejrnaes; R. Cristiano; T. Taino; H. Myoren; Roman Sobolewski; G. Pepe
  PHYSICAL REVIEW B, Volume：92, Number：1, First page：014501, Jul. 2015, [Reviewed]
  Thermal fluctuations in hybrid superconductor/ferromagnetic NbN/NiCu bilayers, as well as in pure superconducting NbN, two-dimensional (2D), nanostripes, have been investigated in order to understand the origin of dark counts in superconducting nanostripes when operated as single-photon detectors in the temperature range from 4.2 to 8 K. In 2D superconductors, the dynamics of vortex motion play a significant role in the formation of a transient normal state, leading to dark-count events in current-biased nanostripes. By introducing a weak ferromagnetic overlayer on top of pure NbN, we managed to control the vortex dynamics, which subsequently enabled us to differentiate between several proposed theoretical models. In particular, a 6 - nm - thick NiCu film grown on top of 8 - nm - thick NbN nanostripes led to an enhanced critical current density in the resulting nanostructure, as well as significantly lowered fluctuation rates, as compared to pure NbN structures, leading to reduced dark counts. The enhancement of pinning in NbN/NiCu bilayers provided evidence that thermal excitations of single vortices (vortex hopping) near the edge of a 2D nanostripe were the dominant mechanism of the observed dark-count transients. On the other hand, in pure NbN the leading source of thermal fluctuations was the current-assisted thermal unbinding of vortex-antivortex pairs.
  AMER PHYSICAL SOC, English, Scientific journal
  DOI：https://doi.org/10.1103/PhysRevB.92.014501
  DOI ID：10.1103/PhysRevB.92.014501, ISSN：1098-0121, eISSN：1550-235X, Web of Science ID：WOS:000357484100007
• Single-Flux Quantum Readout Circuits for Photon-Number-Resolving Superconducting Nanowire Single-Photon Detectors　　　　　　　　　　　　　　　
  Hiroaki Myoren; Shunsuke Takeda; Masato Naruse; Tohru Taino; Jian Chen; Peiheng Wu
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：25, Number：3, First page：2200204, Jun. 2015, [Reviewed]
  Superconducting nanowire single-photon detectors (SNSPDs) with series-parallel meander-type configurations are demonstrated to have photon-number-resolving capabilities and are expected to be used for an evaluation system of single-photon generators and/or an energy-resolved fast detector for a new-generation time-of-flight mass spectrometry. In this paper, we present the design, fabrication, and confirmation of correct operations of two kinds of single-flux-quantum (SFQ) digital readout circuits for an SNSPD with a series-parallel meander-type configuration. Assuming a six-parallel meander-type configuration, we designed: 1) a six-level current discriminator using six different magnetically coupled DC/SFQ converter circuits; and 2) a Delta-type A/D converter using a quasi-one-junction SQUID (QOS) comparator with an SFQ feedback loop. For the design of the magnetically coupled inputs, we used a 3-D inductance extraction program FastHenry and the designed circuits were fabricated using a HYPRES 4.5-kA/cm(2) Nb process and a National Institute of Advanced Industrial Science and Technology (AIST) standard 2.5-kA/cm(2) Nb process.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2014.2365356
  DOI ID：10.1109/TASC.2014.2365356, ISSN：1051-8223, eISSN：1558-2515, Web of Science ID：WOS:000384888700001
• Dark counts in superconducting single-photon NbN/NiCu detectors　　　　　　　　　　　　　　　
  L. Parlato, U. Nasti, M. Ejrnaes, R. Cristiano, H. Myoren, R. Sobolewski, G.P. Pepe
  Proc. SPIE 9504, Photon Counting Applications 2015, Volume：9504, First page：950404, 2015
• Design and Performance of Digital SQUID with Sub-Flux Quantum Resolution　　　　　　　　　　　　　　　
  Hiroaki Myoren; Kouhei Takatoku; Masato Naruse; Tohru Taino
  2015 15TH INTERNATIONAL SUPERCONDUCTIVE ELECTRONICS CONFERENCE (ISEC), First page：P, Last page：22, 2015
  Digital SQUIDs based on the single flux quantum (SFQ) logic have attractive characteristics, such as wide dynamic range and high slew rate. However, the resolution of digital SQUIDs is limited to SFQ. To realize sub-flux quantum resolution for these SQUIDs, we have adopted two types of feedback combinations: one with the SFQ input/output for a main loop and the other with a mutually coupled loop. The main loop receives direct Phi(0) feedback and sub-flux quantum feedback Phi(0)/n, where n is an integer, from the mutually coupled loop. We confirmed the correct operation of our device at a clock frequency of 1.25 GHz for a digital SQUID with a sub-Phi(0) flux feedback resolution of Phi(0)/8 from circuit simulation. The slew rate is found to be 1.56x10(8) Phi(0)/s in this simulation (f(c) = 1.25 GHz, n=8). The flux resolution for the digital SQUID shows improvement with increasing n and reached below 40 m Phi(0) with n=2(10); however the slew rate is decreased with increasing n and reached 1.22x10(6) Phi(0)/s with f(c)=1.25 GHz and n=2(10).
  IEEE, English, International conference proceedings
  Web of Science ID：WOS:000380391200018
• SFQ Amplified Circuit for Photon-Number-Resolving SNSPD Array　　　　　　　　　　　　　　　
  Kazuki Ota; Masato Naruse; Tohru Taino; Hiroaki Myoren; Jian Chen; Lin Kang; Peiheng Wu
  2015 15TH INTERNATIONAL SUPERCONDUCTIVE ELECTRONICS CONFERENCE (ISEC), 2015, [Reviewed]
  Superconducting nanowire single-photon detectors (SNSPDs) with series-parallel meander-type configuration are demonstrated to have photon-number-resolving (PNR) capabilities. Based on this unique feature, SNSPDs are expected to be used in the evaluation of single photon sources. However, increasing the number of SNSPDs causes an increase in the heat flow and further degradation in the timing jitter. To resolve this problem, the use of single flux quantum (SFQ) logic circuits is proposed. In this study, we present the read-out circuit for the SNSPD array, based on the SFQ logic. Our design of the read-out circuit makes it feasible to simultaneously process six SNSPD signals at 500 MHz and amplify the output voltage as an input to other circuits without the need for any amplifiers. We confirm using simulations that our designed read-out circuit has these capabilities. Furthermore, it is shown that the output voltage increases by 4.8 mV, proportional to the number of SNSPD signals and the output voltage is between 4.8 and 27.8 mV.
  IEEE, English, International conference proceedings
  Web of Science ID：WOS:000380391200053
• Design of 8-bit Low-energy SFQ Up/Down Counter for Digital DROS　　　　　　　　　　　　　　　
  B. Zhang, M. Naruse, T. Taino, H. Myoren
  Superconducting SFQ VLSI Workshop SSV2014 for Young Scientists, First page：P, Last page：12, 2014
• 7 GHz Operation Design for Digital DROS coupled with Relaxa-tion Oscillation Circuit　　　　　　　　　　　　　　　
  R. Kobayashi, M. Naruse, T. Taino, H. Myoren
  Superconducting SFQ VLSI Workshop SSV2014, First page：P, Last page：18, 2014
• Fabrication Process of STJ Array with Boron Neutron Absorbers for Multi-Quantum Beam Detectors　　　　　　　　　　　　　　　
  N. Hirosaki, M. Naruse, T. Taino, H. Myoren
  Superconducting SFQ VLSI Workshop SSV2014, First page：P, Last page：19, 2014
• SFQ Readout Circuits for Photon-Number-Resolving SNSPDs　　　　　　　　　　　　　　　
  S. Takeda, M. Naruse, T. Taino, J. Chen, P. Wu, H. Myoren
  Superconducting SFQ VLSI Workshop SSV2014, First page：P, Last page：21, 2014
• Optical Efficiencies of Lens-Antenna Coupled Kinetic Inductance Detectors at 220 GHz　　　　　　　　　　　　　　　
  Masato Naruse; Yutaro Sekimoto; Takashi Noguchi; Akihira Miyachi; Kenichi Karatsu; Tom Nitta; Masakazu Sekine; Yoshinori Uzawa; Tohru Taino; Hiroaki Myoren
  IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY, Volume：3, Number：2, First page：180, Last page：186, Mar. 2013, [Reviewed]
  We have been developing a terahertz camera based on antenna-coupled superconducting resonators, the so-called microwave kinetic inductance detectors (MKIDs), and a silicon lens array. The MKID consists of a coplanar waveguide coupled to a double slot antenna and is patterned on a high-quality aluminum film grown by molecular beam epitaxy. The camera is sensitive at frequencies of 200-240 GHz. Its bandwidth is limited by the impedance properties of the double slot antenna. The design, fabrication, and optical evaluations of the planar antennas and silicon lens arrays are presented in this paper. The MKID camera has been evaluated both in dark conditions and under optical radiation in a 0.1-K dilution refrigerator. The electrical noise equivalent power was around 5x10(-18)W/root HZ in dark conditions and 4x10(-16)W/root HZ, which is much lower than the photon noise level, with the optical load. The optical efficiency of the camera was estimated by three independent methods, and the results were consistent with each other and equal to 20%-25% without an anti-reflection coating on the lens surface.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TTHZ.2012.2237029
  DOI ID：10.1109/TTHZ.2012.2237029, ISSN：2156-342X, eISSN：2156-3446, Web of Science ID：WOS:000318770300010
• SFQ Readout Circuit for Photon-Number-Resolving SNSPDs　　　　　　　　　　　　　　　
  H. Myoren
  Superconducting SFQ VLSI Workshop SSV2013, First page：O, Last page：7, 2013
• Performance of superconducting single-photon detectors using NbN/NiCu nanowires　　　　　　　　　　　　　　　
  H. Myoren; S. Taguchi; K. Ohshima; T. Wakatsuki; T. Taino; L. Parlato; G. P. Pepe
  IEEE Transactions on Applied Superconductivity, Volume：23, Number：3, First page：22013, 2013, [Reviewed]
  We present optical properties of nanowires consisting of both proximitized superconductor/ferromagnet bilayers of NbN/NiCu and pure superconducting NbN layers. Thin NbN/NiCu hetero-structures were deposited on MgO(100) substrates by in situ dc magnetron sputtering, while nanowires were patterned using standard electron beam lithography and reactive ion etching. Photo-response signals were recorded from 100-nm-wide, three-parallel and six-series NbN(8 nm)/NiCu nanowires by 850-nm pulsed laser irradiation (time width 400 ps, repetition rate ∼100 MHz). For the latter configuration the fall time of voltage responses was found to be close to 1.7 ns, and it gradually increased with increasing the NiCu film thickness. Moreover, three discrete families of photo-response signals recorded for the three-parallel and six-series nanowires were also observed. © 2002-2011 IEEE.
  English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2013.2252344
  DOI ID：10.1109/TASC.2013.2252344, ISSN：1051-8223, SCOPUS ID：84876135686
• SFQ Digital Signal Processing Circuits for Multi-Quantum Beam Detectors using STJ Array with Neutron Absorbers　　　　　　　　　　　　　　　
  Hiroaki Myoren; Yuta Akamatsu; Ryo Sasaki; Shoji Sato; Masato Naruse; Tohru Taino
  2013 IEEE 14TH INTERNATIONAL SUPERCONDUCTIVE ELECTRONICS CONFERENCE (ISEC), First page：6604290, 2013
  We studied multi-quantum beam detectors using a superconducting tunnel junction (STJ) array with neutron absorbers. Using a neutron absorber for each of the STJs, we expected the STJ detector to exhibit a high spatial resolution and high detection efficiency for neutrons as well as radiative beams such as X-rays. To obtain diffraction patterns of the Xray and neutrons, we propose the use of a multi-quantum beam detector using an STJ array and single flux quantum (SFQ) signal processing at low temperature because of its high-speed and low-power operation. The kinetic energy is determined for individual neutrons using time-of-flight-methods that employ SFQ time-to-digital converters (TDCs). To separately detect alpha-particles and gamma-ray particles that are produced by the nuclear reaction between neutrons and boron, and X-ray photons, excess quasi-particle currents of the STJ detectors are processed by V/F type analog-to-digital converters and T-FF binary counters using SFQ digital circuits. To obtain the multiplexed readout of an STJ detector array, we designed a current bias switching circuit controlled by an SFQ driver for time-domain multiplexing. We designed the main circuits for this SFQ signal processing system and fabricated them using the ISTEC SRL Nb standard process II (STP2).
  IEEE, English, International conference proceedings
  Web of Science ID：WOS:000333277300034
• SFQ Circuits for Multi-Quantum Beam Detectors　　　　　　　　　　　　　　　
  H. Myoren
  Superconducting SFQ VLSI Workshop SSV2012, First page：O, Last page：5, 2012
• Design of Digital DROS for Wide Dynamic Operation Range with sub-single flux quantum resolution　　　　　　　　　　　　　　　
  Hiroaki Myoren; Kohsuke Terui; Naoya Shimada; Tohru Taino
  SUPERCONDUCTIVITY CENTENNIAL CONFERENCE 2011, Volume：36, First page：121, Last page：126, 2012, [Reviewed]
  We designed a digital double relaxation oscillation SQUID (DROS) with an single flux quantum (SFQ) feedback circuit for digital SQUID magnetometers. The DROS is magneticall coupled to a feedback SQUID loop and a signal magnetic flux is input to the feedback SQUID loop. The DROS generates two kinds of voltage pulses corresponding to the total magnetic flux in the feedback SQUID loop. Those voltage pulses are converted to SFQ and anti-SFQ pulses and input to the feedback SQUID loop to keep the magnetic flux in the feedback SQUID loop constant. A read-out dc SQUID (R/O SQUID) is also magnetically coupled to the feedback SQUID loop for monitoring the actual magnetic flux in the feedback SQUID loop. The number of the generated SFQ pulses is estimated by SFQ feedback steps on output voltage curves generated from the R/O SQUID. Wide dynamic operation range is realized by the SFQ feedback and sub-Phi(0) magnetic flux resolution is realized by the R/O SQUID, where Phi(0)(= h/2e) is the single magnetic flux quantum. Also one digital DROS magnetometer can be operated with less than 10 mA. We fabricated a designed digital DROS using ISTEC SRL 2.5 kA/cm(2) Nb standard process II and are trying to confirm the correct operation of the digital DROS. (C) 2012 Published by Elsevier B.V. Selection and/or peer-review under responsibility of the Guest Editors.
  ELSEVIER SCIENCE BV, English, International conference proceedings
  DOI：https://doi.org/10.1016/j.phpro.2012.06.057
  DOI ID：10.1016/j.phpro.2012.06.057, ISSN：1875-3892, Web of Science ID：WOS:000314403400022
• Quasiparticle energy relaxation times in NbN/CuNi nanostripes from critical velocity measurements　　　　　　　　　　　　　　　
  C. Cirillo, V. Pagliarulo, H. Myoren, C. Bonavolonta, L. Parlato, G. P. Pepe, and C. Attanasio
  Physical Review B, Volume：84, First page：054536, Aug. 2011, [Reviewed]
• Design of Digital DROS With SFQ Up/Down Counter for Wide Dynamic Operation Range　　　　　　　　　　　　　　　
  Hiroaki Myoren; Yun Kimimoto; Kosuke Terui; Tohru Taino
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：21, Number：3, First page：387, Last page：390, Jun. 2011, [Reviewed]
  We designed a digital double relaxation oscillation SQUID (DROS) with an SFQ up/down counter. The DROS is connected to a feedback SQUID loop and a signal magnetic flux is input to the feedback SQUID loop. The DROS generates two kinds of voltage pulses corresponding to the total magnetic flux in the feedback SQUID loop. Two kind of voltage pulses are converted to SFQ and anti-SFQ pulses and input to the feedback SQUID loop to keep the magnetic flux in the SQUID loop constant. The number of the generated SFQ pulses is counted using the SFQ up/down counter. Thus, the count corresponds to the input magnetic flux. Because the SFQ up/down counter is operated in the pulse driven mode, the digital DROS needs only dc bias current for operation. We designed and fabricated a digital DROS with a relaxation oscillation frequency of 3 GHz and an 8-bit SFQ up/down counter. Numerical simulation suggested the designed digital DROS has a dynamic range exceeding +/- 100 Phi(0) and magnetic flux slew rate of 3 x 10(9) Phi(0)/s.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2010.2100800
  DOI ID：10.1109/TASC.2010.2100800, ISSN：1051-8223, Web of Science ID：WOS:000291050500068
• Strong critical current density enhancement in NiCu/NbN superconducting nanostripes for optical detection　　　　　　　　　　　　　　　
  N. Marrocco; G. P. Pepe; A. Capretti; L. Parlato; V. Pagliarulo; G. Peluso; A. Barone; R. Cristiano; M. Ejrnaes; A. Casaburi; N. Kashiwazaki; T. Taino; H. Myoren; Roman Sobolewski
  APPLIED PHYSICS LETTERS, Volume：97, Number：9, First page：92504, Aug. 2010, [Reviewed]
  We present measurements of ferromagnet/superconductor (NiCu/NbN) and plain superconducting (NbN) nanostripes with the linewidth ranging from 150 to 300 nm. The NiCu (3 nm)/NbN (8 nm) bilayers, as compared to NbN (8 nm), showed a up to six times increase in their critical current density, reaching at 4.2 K the values of 5.5 MA/cm(2) for a 150 nm wide nanostripe meander and 12.1 MA/cm(2) for a 300 nm one. We also observed six-time sensitivity enhancement when. the 150 nm wide NiCu/NbN nanostripe was used as an optical detector. The strong critical current enhancement is explained by the vortex pinning strength and density increase in NiCu/NbN bilayers and confirmed by approximately tenfold increase in the vortex polarizability factor. (C) 2010 American Institute of Physics. [doi:10.1063/1.3479529]
  AMER INST PHYSICS, English, Scientific journal
  DOI：https://doi.org/10.1063/1.3479529
  DOI ID：10.1063/1.3479529, ISSN：0003-6951, Web of Science ID：WOS:000282187200042
• Interconnect Wires for SFQ VLSIs　　　　　　　　　　　　　　　
  H.Myoren, Y.Suzukawa, M.Miyamoto, T.Taino
  Superconducting SFQ VLSI Workshop Proceedings, First page：A01, Last page：3, 2010
• Optical Interface for SFQ LSI using NbN/NiCu Parallel Nanowire Photo Switches　　　　　　　　　　　　　　　
  H.Myoren, H.Yamamoto, N.Kashiwazaki, Y.Matsui, T.Taino, G.P.Pepe
  EUCAS2009, First page：P, Last page：572, 2010
• Photoresponse experiments on NbN proximized nanostructures　　　　　　　　　　　　　　　
  G. P. Pepe; L. Parlato; V. Pagliarulo; N. Marrocco; C. De Lisio; G. Peluso; A. Barone; T. Taino; H. Myoren; A. Casaburi; M. Ejrnaes; R. Cristiano
  9TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS 09), Volume：234, First page：42027, 2010, [Reviewed]
  Among superconducting materials used in developing high performance nanowire detectors, NbN demonstrated to have unique characteristics in terms of fast response time, quantum efficiency and photon-number resolving capability. We investigated the role of proximity effect on superconducting NbN thin films covered by a weak ferromagnetic NiCu thin layer. Hetero-structures NbN/NiCu have been deposited by DC magnetron sputtering on MgO substrates without any heating. Characterization in terms of morphological, transport, and ultra-fast optical properties has been done. Superconducting nanowires with meander-type geometries (48 micron lengths and <500 nm widths) have been designed and fabricated. Preliminary results concerning their photoresponse to 1550nm laser irradiation are presented.
  IOP PUBLISHING LTD, English, International conference proceedings
  DOI：https://doi.org/10.1088/1742-6596/234/4/042027
  DOI ID：10.1088/1742-6596/234/4/042027, ISSN：1742-6588, Web of Science ID：WOS:000304593700192
• SFQ Multiplexed Signal Processing Circuits for STJ Photon Detector Arrays　　　　　　　　　　　　　　　
  Hiroaki Myoren; Yu Yoshizawa; Tohru Taino
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：19, Number：3, First page：413, Last page：416, Jun. 2009, [Reviewed]
  We have been studying single flux quantum (SFQ) digital signal processing (DSP) circuits for superconducting tunnel junction (STJ) photon detector arrays. The proposed DSP circuit consists of a binary tree of multiplexers, a time counter, a binary counter, and a readout memory. Each multiplexer was designed such that the first arriving SFQ pulse train connects to the binary counter until the time counter reaches a set value. The time counter is set to a sufficiently long time compared with the response time of STJ photon detector. After processing the multiplexer, SFQ pulses are integrated by the binary counter. The number of integrated SFQ pulses is proportional to the number of quasi-particles generated by photon irradiation in an STJ. After the time counter reaches the set value, the time counter generates a set SFQ pulse to set the multiplexer in the ready state, the integrated value is sent to the readout memory and then the binary counter is reset. The binary tree of multiplexers could be extended to have address bits for photon imaging using an STJ array. One key component of the proposed DSP circuit was fabricated and its operation using an on-chip clock generator was successfully demonstrated.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2009.2017947
  DOI ID：10.1109/TASC.2009.2017947, ISSN：1051-8223, Web of Science ID：WOS:000268282000067
• Ultrafast optical characaterization of NbN proximized structures　　　　　　　　　　　　　　　
  G.P.Pepe, L.Parlato, V.Pagliarulo, N.Marrocco, T.Taino, H.Myoren, A.Casaburi, and R.Cristiano
  Int. Superconductive Electronics Conference 2009, First page：MD, Last page：P37, 2009
• Ultrafast optical characterization of NbN proximized nanostructures　　　　　　　　　　　　　　　
  G.P.Pepe, L.Parlato, V.Pagliarulo, N.Marrocco, G.Peluso, A.Barone, T.Taino, H.Myoren, A.Casaburi, R.Cristiano
  9th European Conference on Applied Superconductivity, First page：P, Last page：119, 2009
• Propagation Property of Sub-Micron-Wide Superconducting Microstrip Lines for SFQ Circuits　　　　　　　　　　　　　　　
  Y.Suzukawa, T.Taino, H.Myoren
  Superconducting SFQ VLSI Workshop, First page：P2, 2009
• On-Chip SFQ Flux-Locked Loop Circuits for Digital DROS Sensors　　　　　　　　　　　　　　　
  H.Myoren, S.Iino, T.Taino
  Superconducting SFQ VLSI Workshop, First page：P2, 2009
• Low Noise Photon Detector using Superconducting Tunnel Junction　　　　　　　　　　　　　　　
  Taino T., Matsubara K., Nakagawa H., Kikuchi K., Aoyagi M., Sato H., Myoren H.
  euroflux2008 international conference extended abstract, First page：119, Last page：120, 2008
• Fabrication of STJ integrated on the microstrip-coil for photon detectors　　　　　　　　　　　　　　　
  Matsubara K., Taino T., Kikuchi K., Nakagawa H., Aoyagi M., Sato H., Myoren H.
  The 1st International Forum on Frontier Photonics proceedings, First page：65, Last page：68, 2008
• Superconducting NbN Nanowire Photo Switches for Generating Single Flux Quantum Pulses　　　　　　　　　　　　　　　
  Hiroaki Myoren; Yusuke Mada; Yuji Matsui; Tohru Taino; Susumu Takada
  8TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS'07), Volume：97, First page：012329,1, Last page：6, 2008, [Reviewed]
  We investigated superconducting NbN nanowire as a photo switch for generating single flux quantum (SFQ) pulses. Epitaxially grown NbN thin films were prepared on MgO(100) substrates by a dc magnetron sputtering method using gas mixture of Ar + N(2), without substrate heating. NbN thin films showed Tc of 13.6 K for 8 nm, and 10 K for 4 nm. NbN nanowires were patterned using a electron beam lithography with 200 nm thick electron beam resist. To increasing photo-sensitive regions, we fabricated 50 x 50 1 m 2 meander patterns with NbN nanowires. Line width of nanowires was varied from 150 nm to 500 nm. Critical current density of NbN nanowires was about 3x10(6) A/cm(2) at 4.2 K. We irradiated 850-nm laser pulses via 50-1 m multi-mode optical fibers. Repetition frequency and pulse width could be controlled by a pulse pattern generator. The maximum laser pulse power was about 1 mW. Using 150-nm-wide NbN nanowires, half of critical current was suppressed by 1 mW CW laser irradiations. High speed responses were observed for laser pulses with repetition frequency of 1 MHz and pulse width of 2 ns. Besides the NbN nanowire photo switches, we designed an SFQ interface circuit based on Josephson transmission lines. The designed circuit could generate SFQ pulses by input current of 10 mu A, 25 GHz current pulses. Dc bias margin of the circuit was +/-15% for 60 mu A current pulses.
  IOP PUBLISHING LTD, English, International conference proceedings
  DOI：https://doi.org/10.1088/1742-6596/97/1/012329
  DOI ID：10.1088/1742-6596/97/1/012329, ISSN：1742-6588, eISSN：1742-6596, Web of Science ID：WOS:000276054100328
• Terahertz electromagnetic-wave detector using Nb-based superconducting tunnel junction on LiNbO< sub> 3 substrate absorber　　　　　　　　　　　　　　　
  T. Taino; H. Ishii; S. Yoshimura; C. Otani; S. Ariyoshi; H. Myoren; K. Kawase; T. Shibuya; H. Sato; H. M. Shimizu; S. Takada
  Physica C: Superconductivity, Volume：463-465, First page：1119, Last page：1122, Oct. 2007, [Reviewed]
  We have been developing terahertz (THz) wave detectors using superconducting tunnel junctions (STJs). The STJs consist of the Nb/Al/AlO x /Al/Nb structure. We fabricated THz-wave detectors on LiNbO 3 substrates that have a high absorption coefficient for the frequency range of 10 12 Hz. Two kinds of signals were detected when the THz-wave was irradiated from the substrate side. One was an indirect signal related to the generation of phonons. The other was a signal that corresponds to directly generated quasi-particles in the Nb electrode of the STJ. The pulse height of the indirect signal was larger than that of the latter signal. To enlarge the detector area, we designed a STJ that has different areas of the base electrode and top electrode. In this paper, the characteristics of the THz-wave detector area will be discussed. © 2007 Elsevier B.V. All rights reserved.
  DOI：https://doi.org/10.1016/j.physc.2007.03.500
  DOI ID：10.1016/j.physc.2007.03.500, ISSN：0921-4534, J-Global ID：200902248422821370, SCOPUS ID：34548454987
• Minimization of parasitic inductances in SFQ circuits using over- and under-ground planes　　　　　　　　　　　　　　　
  Hiroaki Myoren; Noriaki Kishita; Tohru Taino; Susumu Takada
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：17, Number：2, First page：462, Last page：465, Jun. 2007, [Reviewed]
  We designed the single-flux-quantum (SFQ) circuits that were fabricating using the NEC 2.5 kA/cm(2) standard process that has four Nb layers. Before designing circuits with two ground planes, we estimated sheet inductances, of the base and counter planes,using simple rectangular-shape inductors. Estimated sheet inductance of the base plane was 0.75 of the original value for the circuits with only under-ground plane. For the counter plane, sheet inductance was estimated to be 0.55 of the original value. We designed a 2-branch D-FF gate and fabricated SFQ circuits including the 2-branch D-FF using the NEC standard process. Parasitic inductances of the counter layer in the 2-branch D-FF were effectively minimized using two ground planes and frequency dependences of the lower bias margin were improved.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2007.898053
  DOI ID：10.1109/TASC.2007.898053, ISSN：1051-8223, Web of Science ID：WOS:000248442200090
• X-ray detection using superconducting tunnel junction shaped normal-distribution-function　　　　　　　　　　　　　　　
  Tohru Taino; Tomohiro Nishihara; Koichi Hoshino; Hiroaki Myoren; Hiromi Sato; Hirohiko M. Shimizu; Susumu Takada
  IEICE TRANSACTIONS ON ELECTRONICS, Volume：E90C, Number：3, First page：566, Last page：569, Mar. 2007, [Reviewed]
  A normal-distribution-function-shaped superconducting tunnel junction (NDF-STJ) which consists of Nb/Al-AlOx/Al/Nb has been fabricated as an X-ray detector. Current - voltage characteristics were measured at 0.4 K using three kinds of STJs, which have the dispersion parameters sigma of 0.25, 0.45 and 0.75. These STJs showed very low subgap leakage current of about 5 nA. By irradiating with 5.9 keV X-rays, we obtained the spectrum of these NDF-STJs. They showed good energy resolution with small magnetic fields of below 3 mT, which is about one-tenth of those for conventional-shaped STJs.
  IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, English, Scientific journal
  DOI：https://doi.org/10.1093/ietele/e90-c.3.566
  DOI ID：10.1093/ietele/e90-c.3.566, ISSN：0916-8524, eISSN：1745-1353, CiNii Articles ID：30026214645, Web of Science ID：WOS:000245194400004
• Large array system by using superconducting tunnel junctions　　　　　　　　　　　　　　　
  Myoren H.
  The Third CREST Nano-Virtual-Labs Joint Workshop on Superconductivity 2007-Superconducting Sensors, First page：16, Last page：17, 2007
• Magnetic Shield for SFQ Digital Circuits using Over- and Under Ground Planes Connecting with Wall Structures　　　　　　　　　　　　　　　
  Myoren H., Kishita N., Yoshizawa Y., Taino T., Takada S.
  Ext. Abs. International Superconductive Electronics Conference 2007, First page：P, Last page：B11, 2007
• A broadband terahertz detector using a superconducting tunnel junction　　　　　　　　　　　　　　　
  T. Taino; R. Nakano; S. Yoshimura; H. Myoren; S. Takada; C. Otani; S. Ariyoshi; T. Shibuya; K. Kawase; H. Sato; H. M. Shimizu
  Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume：559, Number：2, First page：751, Last page：753, Apr. 2006, [Reviewed]
  We have proposed and demonstrated a new broadband terahertz (THz) wave detector using a superconducting tunnel junction (STJ) fabricated on LiNbO3, LiTaO3, and sapphire substrates. These substrates have relatively high absorption efficiency for THz waves, and we have expected that incident THz waves from substrate side are absorbed and that generate many THz phonons which break Cooper pairs in the base superconductor electrode of the STJ. Using a frequency-tunable THz pulse source in 1-2 THz, we have confirmed that the current signal corresponding to the THz input was observed. In addition, we found two current components with different timescales for the first time. We interpret that the slow component corresponds to phonons absorbed with the substrate and that the fast one corresponds to the directly absorbed photons with the superconductor electrode of the STJs. © 2006 Elsevier B.V. All rights reserved.
  Scientific journal
  DOI：https://doi.org/10.1016/j.nima.2005.12.207
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=33645883838&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=33645883838&origin=inward
  DOI ID：10.1016/j.nima.2005.12.207, ISSN：0168-9002, SCOPUS ID：33645883838
• Polyimide Buffer Layer for STJ Photon Detector　　　　　　　　　　　　　　　
  T. Taino; M. Yoshida; M. Narisawa; H. Myoren; K. Kikuchi; H. Nakagawa; M. Aoyagi; H. Sato; H. M. Shimizu; S. Takada
  7TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS'05), Volume：43, First page：1319, Last page：1321, 2006, [Reviewed]
  We have proposed and been developing ultra low noise photon detector using superconducting tunnel junctions (STJs). The STJs are fabricated on polyimide ( PI) layer which is prepared on sapphire substrate. The PI is coated on the substrate before making the STJ. It acts as buffer layer to suppress a great deal of phonon events which come from the substrate. For low energy application such as soft X-ray and extreme ultraviolet, the STJs with PI buffer layer is a very attractive detector because the spectrum of low energy photons can measured clearly without noise that depends on phonon events in the substrate. We fabricated the STJs with PI buffer layer which are different thickness and measured X-ray spectrum of 5.9 keV. We found that polyimide of 100 nm thickness is enough to suppress phonon events in low energy range.
  IOP PUBLISHING LTD, English, International conference proceedings
  DOI：https://doi.org/10.1088/1742-6596/43/1/322
  DOI ID：10.1088/1742-6596/43/1/322, ISSN：1742-6588, Web of Science ID：WOS:000277479400322
• Quasiparticles Injection Effects for Nb/Al/AlOx/Al/Nb Tunnel Junctions at 0.4K using Stacked Josephson Junctions　　　　　　　　　　　　　　　
  Hiroaki Myoren; Akiko Shigihara; Tohru Taino; Susumu Takada
  7TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS'05), Volume：43, First page：1326, Last page：1329, 2006, [Reviewed]
  We have studied on the quasiparticles (QPs) injection effects for Nb/Al/AlOx/Al/Nb tunnel junctions at 0.4 K. A device structure was a stack of an injector Josephson junction (JJ) and a detector JJ. At a low temperature, there is small number of thermally excited QPs and we expected to observe easily the QPs injection effect of the detector JJ using the injector JJ. In this study, the structure of the Nb/Al/AlOx/Al/Nb tunnel junctions was the same for X-ray detectors using superconducting tunnel junctions. For constant-QPs current injection, we expected a small-signal current gain exceed the unity. We used pulsed-QPs current with changing pulse duration. For long duration, I-V curves for the detection junctions were sum of original current and QP current. On the other hands, for short duration time, the I-V curves showed different shapes from those for the long duration time.
  IOP PUBLISHING LTD, English, International conference proceedings
  DOI：https://doi.org/10.1088/1742-6596/43/1/324
  DOI ID：10.1088/1742-6596/43/1/324, ISSN：1742-6588, Web of Science ID：WOS:000277479400324
• Direct and Indirect Detection of Terahertz Waves using a Nb-based Superconducting Tunnel Junction　　　　　　　　　　　　　　　
  Otani Chiko; Nakano Ran; Taino Tohru; Shibuya Takayuki; Ariyoshi Seiichiro; Yoshimura Shota; Myoren Hiroaki; Sato Hiromi; Shimizu Hirohiko M; Takada Susumu; Kawase Kodo
  7TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS'05), Volume：43, First page：1303, Last page：1306, 2006, [Reviewed]
  DOI：https://doi.org/10.1088/1742-6596/43/1/318
  DOI ID：10.1088/1742-6596/43/1/318, ISSN：1742-6588, Web of Science ID：WOS:000277479400318
• Development of terahertz wave detector using superconducting tunnel junction　　　　　　　　　　　　　　　
  T Taino; K Hoshino; R Nakano; C Otani; H Myoren; K Kawase; T Shibuya; H Sato; HM Shimizu; S Takada
  PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, Volume：426, First page：1731, Last page：1735, Oct. 2005, [Reviewed]
  We have developed a new terahertz (THz) wave detector using an Nb-based superconducting tunnel junction (STJ). The STJ consists of a Nb/Al/AlOx/Al/Nb structure on a single-crystal LiNbO3 substrate. Using LiNbO3 as a substrate, an irradiating THz wave is converted to phonons in LiNbO3, which has a relatively high absorption coefficient. The phonons propagating in the substrate reach the Nb base electrode of the STJ and break Cooper pairs. As a result, the THz wave can be detected as tunneling current signals in the STJ. THz waves from a widely tunable THz-wave parametric oscillator (TPO) were irradiated on to the STJ, which acted as a THz wave detector. The STJs were cooled to an operating temperature of 0.4 K using a He-3 cryostat. We have observed STJ signals related to THz wave irradiations. In this paper, fabrication processes and characteristics of THz wave detectors using STJs are also discussed. (c) 2005 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE BV, English, Scientific journal
  DOI：https://doi.org/10.1016/j.physc.2005.02.137
  DOI ID：10.1016/j.physc.2005.02.137, ISSN：0921-4534, Web of Science ID：WOS:000232698700153
• The effect of X-ray irradiating superconducting tunnel junctions on Al2O3 and LiNbO3 substrates　　　　　　　　　　　　　　　
  T Taino; K Hoshino; R Nakano; C Otani; H Myoren; K Kawase; H Sato; HM Shimizu; S Takada
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：15, Number：2, First page：599, Last page：601, Jun. 2005, [Reviewed]
  We have developed a phonon-mediated radiation detector using Nb-based superconducting tunnel junctions (STJs). The STJs are fabricated on a substrate as an absorber of the radiation, and a substantial amount of emergent phonons with an energy above the energy gap are detected. The performance of the detector depends on the collection efficiency of the phonons. A selection of an appropriate substrate is required for optimizing the detector performance. We fabricated Nb-based STJs on a Al2O3 and a LiNbO3 substrates, and compared the pulse heights of substrate phonon events due to X-ray irradiation to the substrates. We found that the maximum pulse height of the phonon events for the LiNbO3 substrate. was about twice of that for the Al2O3 substrate, so that these spectra which was obtained from two STJs showed different shapes, especially the peak due to phonon events.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2005.849953
  DOI ID：10.1109/TASC.2005.849953, ISSN：1051-8223, Web of Science ID：WOS:000229765300131
• Efficient fabrication process for superconducting integrated circuits using photosensitive polyimide insulation layers　　　　　　　　　　　　　　　
  K Kikuchi; M Goto; H Nakagawa; S Segawa; K Tokoro; T Taino; H Myoren; S Takada; M Aoyagi
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：15, Number：2, First page：94, Last page：97, Jun. 2005, [Reviewed]
  Photosensitive polyimide insulation layers have been introduced to fabricate superconducting integrated circuits. It is shown to simplify the fabrication process, because the photosensitive polyimide insulation layer can be patterned by conventional photolithography process, resulting in the etching process unnecessary in the present new fabrication process. Three kinds of contact hole (junction top electrode contact, junction base electrode contact, and resistor contact) are simultaneously formed in the photolithography process of the polyimide. A minimum contact hole size is designed to be 1.5 mu m square for a 3 mu m x 3 mu m squared junction. Superconducting current density of 2.4 x 10(6) A/cm(2) of the contact hole was measured. Palladium resistors were successfully made with through hole contacts of the photosensitive polyimide insulation layer. We demonstrated superconducting integrated circuits using this new fabrication process including the minimum 3 mu m x 3 mu m squared Nb/Al - AlOx/Nb Josephson tunnel junction. The circuit operation is also demonstrated in the fabricated superconducting integrated circuits with the photosensitive polyimide insulation layers.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2005.849702
  DOI ID：10.1109/TASC.2005.849702, ISSN：1051-8223, Web of Science ID：WOS:000229765300006
• A broad-band THz radiation detector using a Nb-based superconducting tunnel junction　　　　　　　　　　　　　　　
  C Otani; T Taino; R Nakano; K Hoshino; Shibuya, I; H Myoren; S Ariyoshi; H Sato; HM Shimizu; S Takada; K Kawase
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：15, Number：2, First page：591, Last page：594, Jun. 2005, [Reviewed]
  We have proposed and been developing a new broad-band terahertz (THz) radiation detector using a Nb-based superconducting tunnel junction (STJ). The STJ's were fabricated on LiNbO3 and LiTaO3 mono-crystal substrates. We radiated monochromatic THz pulses in the range 1-2 THz with the pulse repetition rate of 49 Hz, and successfully detected the corresponding periodic signals via a charge-sensitive preamplifier. The current signal obtained by the derivative of the output signal gave the time response of about 15-20 microseconds. The frequency response was compared with that of a conventional pyro-electric sensor. We found their frequency response showed the similar shape in frequency, demonstrating the flat response of the STJ detector in 1-2 THz. These results show that the detector can be used as a broad-band THz and far-infrared radiation detector above the frequency corresponding to the energy gap of the superconductor used for the base electrode.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2005.849950
  DOI ID：10.1109/TASC.2005.849950, ISSN：1051-8223, J-Global ID：201302272130921625, SCOPUS ID：22044458600, Web of Science ID：WOS:000229765300129
• X-ray detection using superconducting tunnel junctions with polyimide insulation layer　　　　　　　　　　　　　　　
  M Yoshida; K Hoshino; T Taino; H Myoren; S Takada; K Kikuchi; H Nakagawa; M Aoyagi; H Sato; HM Shimizu
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：15, Number：2, First page：606, Last page：608, Jun. 2005, [Reviewed]
  We have fabricated Nb-based superconducting tunnel junctions (STJs) with Al trapping layers using the photosensitive polyimide insulation layer for X-ray detector. It is possible to simplify the fabrication process of the STJs, because the photosensitive polyimide is used as the insulation layer instead of conventional inorganic insulation films without an etching process in a vacuum chamber. The polyimide insulation layer expects to be stable for thermal cycling between 0.3 K and room temperature. The preliminary experiments of 5.9 keV radiation shows the energy resolution of 86 eV.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2005.849955
  DOI ID：10.1109/TASC.2005.849955, ISSN：1051-8223, Web of Science ID：WOS:000229765300133
• Double relaxation oscillation SQUID with a 4JL on-chip digital flux locked-loop circuit　　　　　　　　　　　　　　　
  H Myoren; M Goto; T Taino; K Kikuchi; H Nakagawa; K Tokoro; M Aoyagi; S Takada
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：15, Number：2, First page：332, Last page：335, Jun. 2005, [Reviewed]
  Double relaxation oscillation SQUID (DROS) combined with an on-chip superconducting digital flux locked-loop (FLL) circuit has been proposed. In this study, we described superconducting digital FLL circuit which consists of an 8-bit up/down counter and an 8-bit R-2R ladder D/A converter. The circuit was designed using 4-Junction Logic (4JL)-gates which are driven by a two phase power supply. In the up/down counter, we employed binary carry lookahead (BCL) circuits for high-speed operation. Logic simulations for the BCL 8-bit up/down counter showed correct operation up to 4 GHz, assuming a 2.5 kA/cm(2) Nb/Al-AIO(x)/Nb junction technology. From simulation results high slew rate of 10(7)Phi(0)/s and dynamic range of 2.5 Phi(0) can be expected.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2005.849825
  DOI ID：10.1109/TASC.2005.849825, ISSN：1051-8223, Web of Science ID：WOS:000229765300065
• Design and Fabrication of Digital DROS with Superconducting Flux-Locked Loop Circuit　　　　　　　　　　　　　　　
  Myoren H., Goto M., Taino T., Kikuchi K., Nakagawa H., Tokoro K., Aoyagi M., Takada S.
  Proceedings of 2005 Japan-Taiwan Symposium on Superconductive Electronics, First page：25, Last page：28, 2005
• Detection of direct and indirect terahertz waves using a Nb-based superconducting tunnel junction
  C Otani; R Nakano; T Taino; T Shibuya; S Ariyoshi; H Myoren; H Sato; HM Shimizu; S Takada; K Kawase
  IRMMW-THz2005: The Joint 30th International Conference on Infrared and Millimeter Waves and 13th International Conference on Terahertz Electronics, Vols 1 and 2, Volume：1, First page：263, Last page：264, 2005
  We are developing a broadband THz detectors using Nb-based superconducting tunnel junctions. We found two components in a current signal for 1-2 THz pulse input. From the comparison of results obtained for the signals, the frequency response for the different size of STJs and the STJs fabricated on different substrate materials, we demonstrate that they correspond to photons absorbed with the superconductor electrode (refered as 'direct' component) and phonons generated by photons absorbed with the substrate (refered as 'phonon-mediated' component).
  IEEE, English, International conference proceedings
  SCOPUS ID：33846529873, Web of Science ID：WOS:000237170000134
• Array of superconducting quantum interference devices with multiturn input coil　　　　　　　　　　　　　　　
  T Morooka; H Myoren; S Takada; K Chinone
  JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, Volume：43, Number：5A, First page：2473, Last page：2478, May 2004, [Reviewed]
  Arrays of dc-superconducting quantum interference devices (dc-SQUIDs) were investigated, in which each dc-SQUID element has a multiturn input coil. The dependence of flux noise on the number of turns of the input coil was studied for current amplifiers. SQUID arrays were fabricated by a Nb/AlOx/Nb Josephson tunnel junction fabrication process. Results show that the flux noise of the SQUID array amplifier does not depend on the turn number of the input coil. A SQUID array amplifier consisting of 128 dc-SQUID elements was fabricated, in which each element had a 7-turn input coil and a mutual inductance between the input coil and the SQUID loop of 460 pH. This amplifier showed an ultrahigh current resolution of 1 pA/Hz(0.5) and a maximum input current of 11 muA for signals of 50 kHz, which is sufficient bandwidth for X-ray detection applications. These values correspond to a large dynamic range of 87 dB. The flux-voltage characteristics of this SQUID array, however. showed asymmetric behavior, which originated from electronic resonance in stray capacitance and the mutual inductance between the SQUID loop and the multiturn input coil.
  INST PURE APPLIED PHYSICS, English, Scientific journal
  DOI：https://doi.org/10.1143/JJAP.43.2473
  DOI ID：10.1143/JJAP.43.2473, ISSN：0021-4922, Web of Science ID：WOS:000221703600018
• Design of single-flux-quantum universal gates with a wide operating margin　　　　　　　　　　　　　　　
  H Myoren; Y Wakimizu; S Takada
  SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Volume：16, Number：12, First page：1447, Last page：1451, Dec. 2003, [Reviewed]
  We have successfully designed single-flux-quantum (SFQ) universal gates with a wide operating margin. We have previously presented universal gates such as NAND and NOR gates. These universal gates have a small operating margin and should be optimized to realize a wide operating margin. In this study, we newly designed universal gates and optimized the device parameters using an SFQ circuit-optimizing tool. Assuming a 1 kA cm(-2) Nb/Al-AlOx/Nb junction technology, the newly designed NAND and NOR gates had a critical margin of more than +/-20% for 20 GHz operation. Direct-current bias margins for NAND and NOR gates were also exceeded by +/-30% for 20 GHz operation.
  IOP PUBLISHING LTD, English, Scientific journal
  ISSN：0953-2048, Web of Science ID：WOS:000187796500028
• 1 pA/root Hz amplifier using superconducting quantum interference device array　　　　　　　　　　　　　　　
  T Morooka; H Myoren; S Takada; K Chinone
  JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, Volume：42, Number：11B, First page：L1375, Last page：L1376, Nov. 2003, [Reviewed]
  An ultrahigh current resolution of 1 pA/rootHz was achieved by a superconducting quantum interference device (SQUID) amplifier, which consisted of 128 repeated dc-SQUID elements. Each element had a 7-turn input coil. The SQUID amplifier was fabricated, using a Nb/AlOx/Nb fabrication process. To evaluate current resolution, flux noise and flux-voltage (Phi-V) characteristics were measured at 4.2 K. The Phi-V characteristics showed a large voltage swing of more than 4 mV. The SQUID amplifier was operated at a smooth slope in the Phi-V characteristics, while asymmetric behavior appeared in the same Phi-V characteristics.
  INST PURE APPLIED PHYSICS, English, Scientific journal
  DOI：https://doi.org/10.1143/JJAP.42.L1375
  DOI ID：10.1143/JJAP.42.L1375, ISSN：0021-4922, Web of Science ID：WOS:000187509400010
• Characteristics of flux noise in long superconducting quantum interference device array　　　　　　　　　　　　　　　
  T Morooka; H Myoren; S Takada; K Chinone
  JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, Volume：42, Number：11, First page：6848, Last page：6852, Nov. 2003, [Reviewed]
  The flux noise in a long superconducting quantum interference device (SQUID) array consisting of at least 100 dc-SQUID elements connected in series was characterized analytically, and then compared with measurements. In the analysis, noise sources in the array were shunt resistors for Josephson junctions, a damping resistor for a SQUID loop, the dynamic resistance of the SQUID array, and the noise of electronics at room temperature. The flux noise of the array was calculated analytically as a function of the number of dc-SQUID elements. The results reveal that the flux noise is significantly influenced by the dynamic resistance of the array, although the influence by the dynamic resistance for a single SQUID is negligibly small. The dynamic resistance becomes dominant for the flux noise when the number of SQUID elements in the array exceeds 100. These results agree well with the measured flux noise for a long SQUID array constructed using a Nb/AlOx/Nb fabrication process.
  INST PURE APPLIED PHYSICS, English, Scientific journal
  DOI：https://doi.org/10.1143/JJAP.42.6848
  DOI ID：10.1143/JJAP.42.6848, ISSN：0021-4922, Web of Science ID：WOS:000187509000025
• Nb-based superconducting tunnel junctions with beta-Ta trapping layers for photon detectors　　　　　　　　　　　　　　　
  H Myoren; Y Kogure; S Takada; H Sato; C Otani; HM Shimizu; K Maehata
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：13, Number：2, First page：1136, Last page：1138, Jun. 2003, [Reviewed]
  We have successfully fabricated Nb-based superconducting tunnel junctions (STJs) with beta-Ta trapping layers. In an Nb/beta-Ta stacked structure, beta-Ta film showed the thickness dependence of critical temperature T-c in current-voltage (I-V) characteristics due to the proximity effect from Nb films. We fabricated Nb-based STJs with beta-Ta trapping layers for X-ray detector working at 0.4 K. We obtained an energy resolution of 52 eV for 5.9 keV X-ray irradiation at 0.4 K. We expect a high energy resolution by optimizing the thickness of beta-Ta trapping layers and improving the fabrication process.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2003.814174
  DOI ID：10.1109/TASC.2003.814174, ISSN：1051-8223, Web of Science ID：WOS:000184241700264
• On-chip coil-integrated STJ using the persistent superconducting current for photon detectors　　　　　　　　　　　　　　　
  K Kikuchi; T Taino; M Nanme; H Nakagawa; M Aoyagi; H Sato; H Akoh; T Iizuka; H Myoren; S Takada; K Maehata; K Ishibashi; H Sato; T Ikeda; C Otani; Y Takizawa; T Oku; K Kawai; H Miyasaka; HM Shimizu; H Kato; H Watanabe
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：13, Number：2, First page：1132, Last page：1135, Jun. 2003
  A superconducting tunnel junction (STJ) is very attractive for use in high-energy-resolution photon detectors because. of its small energy gap. To detect a single photon, the Josephson current of the STJ has had to be suppressed by an external magnetic field. We demonstrated an on-chip coil-integrated STJ photon detector, which excludes the external magnetic field, allowing a small device size. A normal-distribution function shape was adopted for the superconducting electrodes, which makes the magnetic field supplied to the STJ small. We devise a new superconducting, photon detector by combining the above techniques. A new Josephson switching gate is also integrated on the same detector chip in order to drive an on-chip integrated coil by a persistent superconducting current. This behavior was confirmed experimentally using the technology of the fabrication process of the Nb/Al-AlOx/Nb Josephson tunnel junction.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2003.814173
  DOI ID：10.1109/TASC.2003.814173, ISSN：1051-8223, Web of Science ID：WOS:000184241700263
• Design of a 4 x 4 Banyan network switch with a dual-buffer structure using SFQ logic circuits　　　　　　　　　　　　　　　
  J Takahashi; H Myoren; S Takada
  IEICE TRANSACTIONS ON ELECTRONICS, Volume：E86C, Number：1, First page：9, Last page：15, Jan. 2003, [Reviewed]
  We have designed a 4 x 4 Banyan switch using SFQ logic circuits. The switch is composed of three parts; one is an input buffer, the second is a contention solver which checks packet contention in a distribution network, and the third is a packet distribution network which distributes contention-free packets to their destination address. The packet distribution network is composed of Batcher-Banyan switch with the input buffer. The contention solver decides to send a data packet to the distribution network, using only internal routing tags which are added to packets in the switch. As the circuit is composed of two parts, the contention solver and the packet distribution network, the transfer rate is raised because it doesn't need to wait any more while a data packet passes through the distribution network. Simulation results using JSIM show that the switch circuit can operate at a clock frequency of 40 GHz.
  IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, English, Scientific journal
  ISSN：0916-8524, eISSN：1745-1353, Web of Science ID：WOS:000180489800003
• Fiske steps of Josephson tunnel junctions formed with normal-distribution function　　　　　　　　　　　　　　　
  K Kikuchi; H Myoren; T Iizuka; S Takada
  JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, Volume：41, Number：8, First page：5131, Last page：5134, Aug. 2002, [Reviewed]
  Magnetic field dependence of Fiske steps has been investigated using Nb/Al-AlOx/Nb tunnel junctions formed with a normal-distribution function with a dispersion parameter of sigma = 0.45. Fiske steps are due to the different resonance mode appearing in the current-voltage characteristics when an external magnetic field is applied to the junctions at 4.2 K. Both positions in the voltage scale and current amplitude of Fiske steps were systematically measured. We found that the amplitudes of the Fiske steps increased gradually, and then decreased monotonically with an increase in magnetic field. All Fiske steps almost completely disappeared at a magnetic field of less than I mT, at which the dc Josephson critical current also decreased to less than 10(-3) of the maximum. The position of Fiske steps in the voltage scale was analyzed using a diamond-shaped junction which corresponds to a 45-degree-rotated square junction.
  INST PURE APPLIED PHYSICS, English, Scientific journal
  DOI：https://doi.org/10.1143/JJAP.41.5131
  DOI ID：10.1143/JJAP.41.5131, ISSN：0021-4922, Web of Science ID：WOS:000180071800025
• Normal distribution function shaped superconducting tunnel junctions with Ta electrodes　　　　　　　　　　　　　　　
  H Myoren; Y Kogure; A Abe; K Kikuchi; T Iizuka; S Takada
  PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, Volume：372, First page：395, Last page：398, Aug. 2002, [Reviewed]
  We prepared normal distribution function shaped (NDF-shaped) superconducting tunnel junctions (STJs) with Ta electrodes. Using two different phases of Ta, we successfully prepared STJs with bcc-Ta and beta-Ta electrodes. The critical current of the NDF-shaped STJs with Ta electrodes showed an exponential decrease for the applied magnetic field. We determined the coherence length for bcc-Ta and beta-Ta combined with Nb at 0.4 K. Coherence lengths were determined to be 21 nm for bcc-Ta and 16 nm for beta-Ta combined with Nb. For the quasiparticle trapping and amplification, beta-Ta is expected to be a good electrode combined with Nb because of the short coherence length. (C) 2002 Elsevier Science B.V. All rights reserved.
  ELSEVIER SCIENCE BV, English, Scientific journal
  ISSN：0921-4534, Web of Science ID：WOS:000177936400096
• Switch using d-wave symmetry of YBa2Cu3O7−δ Josephson junction
  Youichi Enomoto; Tomohiro Nishihara; Hiroaki Myouren; Susumu Takada
  Applied Physics Letters, Volume：81, Number：4, First page：682, Last page：684, Jul. 2002, [Reviewed]
  Switching functions using a parallel connection of conventional-type and π-type junctions have been investigated. Both junctions consist of Nb/Au/YBa2Cu3O7−δ Josephson junctions on YBa2Cu3O7−δ edges, whose faces are (110) and (100). The modulation patterns of critical currents in low magnetic fields indicate that the d-wave component is dominant: the (100) junctions exhibit the conventional type, but the (110) junctions the π type. Superconducting current path is alternated between the conventional junction and the π junction by applied magnetic fields using these anisotropic magnetic field dependences of the critical current.
  AIP Publishing, Scientific journal
  DOI：https://doi.org/10.1063/1.1494108
  DOI ID：10.1063/1.1494108, ISSN：0003-6951, eISSN：1077-3118
• Properties of NbTiN thin films prepared by reactive DC magnetron sputtering　　　　　　　　　　　　　　　
  H Myoren; T Shimizu; T Iizuka; S Takada
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：11, Number：1, First page：3828, Last page：3831, Mar. 2001, [Reviewed]
  We have prepared Nb1-xTixN (NbTiN) thin Rims by reactive de magnetron sputtering without intentional heating. Superconducting properties were strongly related to sputtering conditions. Lattice parameters of NbTiN Alms approached that of bulk NbTiN with decreasing the N-2 mole fraction in Ar and Nz sputtering gas mixture. The film orientation was also strongly related with the sputtering conditions such as gas pressure. NbN thin Alms could grow epitaxially on MgO(100) substrates and showed very smooth surfaces. We found that smooth NbTiN films could be obtained on MgO(100) substrates with epitaxially grown NbN template layer.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  ISSN：1051-8223, Web of Science ID：WOS:000168285900283
• Sidelobes suppression in normal-distribution-shaped Josephson tunnel junctions　　　　　　　　　　　　　　　
  K Kikuchi; H Myoren; T Iizuka; S Takada
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：11, Number：1, First page：855, Last page：858, Mar. 2001, [Reviewed]
  We have studied normal-distribution-shaped Josephson tunnel junctions for STJ (superconducting tunnel junction) photon detector applications. By employing a normal-distribution function to the shape of the superconducting electrodes sidelobes of the Josephson current were entirely suppressed wits a small magnetic field. This behavior was confirmed experimentally by using Nb/AlOx/Nb Josephson tunnel junctions. There were no oscillatory sidelobes in the Josephson current dependence on the magnetic field. Experimental results were in good agreement with theoretical ones. The Josephson current was efficiently suppressed by an external magnetic field of about 0.5 mT at 4.2 K, which is less than one tenth that of other shaped junctions. In the experiment at 0.3 K, Fiske step due to the resonances were not observed by suppression wits a magnetic field of about 1 mT.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  ISSN：1051-8223, Web of Science ID：WOS:000168285400198
• Proposal of a digital double relaxation oscillation SQUID　　　　　　　　　　　　　　　
  H Myoren; M Nakamura; T Iizuka; S Takada
  IEICE TRANSACTIONS ON ELECTRONICS, Volume：E84C, Number：1, First page：49, Last page：54, Jan. 2001, [Reviewed]
  We present a digital double relaxation oscillation SQUID (DROS) with a digital flux-locked-loop (FLL) circuit consisting of an up/down counter and a digital-to-analog (D/A) converter. The up/down counter was: designed using 4 junction logic (4JL) gates operated with a 2-phase power system. The D/A converter was: designed using an R-2R ladder-type D/A converter. We simulated the dynamic behavior of the digital DROS with a digital FLL circuit combined with the 5-bit ripple up/down counter and the D/V converter. Simulation results show correct flux-locked behavior and a high slew rate of 10(7)phi (0)/s for the digital DROS.
  IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, English, Scientific journal
  ISSN：0916-8524, eISSN：1745-1353, Web of Science ID：WOS:000166624700009
• Normal-distribution-function-shaped Josephson tunnel junctions　　　　　　　　　　　　　　　
  K Kikuchi; H Myoren; T Iizuka; S Takada
  APPLIED PHYSICS LETTERS, Volume：77, Number：22, First page：3660, Last page：3661, Nov. 2000
  We have investigated the magnetic field dependence of the Josephson tunnel junctions whose shape is defined with a normal-distribution function. It was revealed that the normal-distribution-shaped Josephson tunnel junctions show an exponential decay and no side lobes of the Josephson current as the external magnetic field is increased. This behavior was confirmed experimentally by using the Nb/AlOx/Nb tunnel junctions with a Josephson critical current density of J(c)=50 A/cm(2), and an area of 10 000 mum(2) corresponding to the "small" junction region. Normal-distribution junctions should have a potential for wide applications to photon detection since the external magnetic field to suppress the Josephson current can be lowered to less than one tenth that of other junctions reported. (C) 2000 American Institute of Physics. [S0003-6951(00)04247-9].
  AMER INST PHYSICS, English, Scientific journal
  DOI：https://doi.org/10.1063/1.1328045
  DOI ID：10.1063/1.1328045, ISSN：0003-6951, eISSN：1077-3118, CiNii Articles ID：80012137640, Web of Science ID：WOS:000165396400059
• Suppression of the Josephson current in normal-distribution-shaped tunnel junctions　　　　　　　　　　　　　　　
  K Kikuchi; H Myoren; T Iizuka; S Takada
  JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, Volume：39, Number：10, First page：5828, Last page：5831, Oct. 2000, [Reviewed]
  The magnetic field dependence of the Josephson current of a Josephson tunnel junction whose shape was a normal distribution is analyzed for superconducting tunnel junction (STJ) photon detector applications. It was found that the Josephson current of a normal distribution junction is very sensitive to the external magnetic field and follows a function of exp(-B-2), while a conventional rectangular STJ exhibits the well-known Fraunhofer pattern of sin x/x. Numerical calculations show that the Josephson current of the normal distribution junction fan be suppressed by an external magnetic field that is one tenth of that needed for conventional rectangular junctions. Calculations of a normal distribution junction approximated with a 1 mum mesh also show that the Josephson current is sufficiently suppressed by a small magnetic field. The effect of the misalignment of the angle between the junction and the magnetic field was evaluated. It was found that for a normal-distribution-shaped junction, misalignment of the magnetic field is allowed within +/-5 degrees, suppressing the Josephson effect by two orders of magnitude more than that of a rectangular junction.
  INST PURE APPLIED PHYSICS, English, Scientific journal
  ISSN：0021-4922, Web of Science ID：WOS:000090139000021
• NAND gate for SFQ logic circuits　　　　　　　　　　　　　　　
  H Myoren; S Ono; S Takada
  IEICE TRANSACTIONS ON ELECTRONICS, Volume：E83C, Number：1, First page：81, Last page：84, Jan. 2000, [Reviewed]
  We propose a universal NAND logic gate based on single flux quantum (SFQ) logic. The NAND gate enables the construction of any logic circuits. In the proposed gate, three superconducting loops share two Josephson junctions (JJs). The critical currents of the JJs were designed to allow each of any two loops to trap an SFQ at the same time. We simulated dynamic operation of this NAND gate. The results show that the NAND gate carl operate with a delay time of 45 ps, and the power consumption of this circuit is close to 0.06 mu W/gate.
  IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, English, Scientific journal
  ISSN：0916-8524, eISSN：1745-1353, Web of Science ID：WOS:000084974300013
• Mm and sub-mm properties of ramp-type Josephson junctions on MgO with STO buffer layers　　　　　　　　　　　　　　　
  H Myoren; J Chen; T Yamashita; L Amatuni; AH Sonnenberg; GJ Gerritsma; H Rogalla
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：9, Number：2, First page：3854, Last page：3857, Jun. 1999, [Reviewed]
  We have successfully fabricated ramp-type junctions on MgO substrates using an SrTiO3 (STO) buffer layer. The observed IcRn product for the junctions on MgO with STO buffer layer were about 2mV at 4.2K and 0.1mV at 60K. The junctions clearly showed Shapiro steps under irradiation of mm-waves and sub-mm-waves. We observed Josephson emission at 50GHz from a junction on a MgO substrate with STO buffer layer at 17K. We have also confirmed mixing in the self-oscillating mode using mm-wave and sub-mm-wave signals.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  ISSN：1051-8223, Web of Science ID：WOS:000081964500248
• Fabrication of Josephson junctions on La-Sr-Cu-O single crystals　　　　　　　　　　　　　　　
  Y Uematsu; H Myoren; K Nakajima; T Yamashita; Tanaka, I; H Kojima
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：9, Number：2, First page：4296, Last page：4299, Jun. 1999, [Reviewed]
  We have successfully fabricated Josephson junctions on single crystals of La2-xSrxCuO4 (LSCO) high - T-c superconductor using niobium (Nb) as counter electrodes. A reproducible fabrication process has been established taking into account the surface state of LSCO is dominantly affecting junction properties. The surface state of LSCO has been characterized using SPS. The current voltage curves (IVCs) of Nb/LSCO junctions exhibit RSJ like Josephson junction properties. Due to intrinsic Josephson effect of LSCO, the IVCs branches are first observed for the Nb/LSCO junctions on LSCO mesa whose interfaces are parallel to the ab-plane of LSCO.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  ISSN：1051-8223, Web of Science ID：WOS:000081964500355
• Variation of LaSrCuO film temperature during pulsed laser deposition on LaSrGaO substrate　　　　　　　　　　　　　　　
  C Buzea; H Myoren; HB Wang; K Nakajima; T Yamashita
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：9, Number：2, First page：2398, Last page：2401, Jun. 1999, [Reviewed]
  By using a conventional laser ablation system, LSCO thin films were deposited on LaSrGaO4(100) substrates in an oxygen environment. During deposition the temperature of the film surface was measured with an infrared pyrometer. The measured temperature decreases following the exponential law of radiation absorption in a material. The experimental results indicate an increase of the deviation from the exponential law with decreasing oxygen pressure in the chamber. The conclusion of this experiment reveals the fact that either the refraction index of the deposited material may vary non-uniformly or the deposition velocity is not a constant during laser ablation.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  ISSN：1051-8223, Web of Science ID：WOS:000081964300245
• High-Tc ramp-type Josephson junctions on MgO substrates for terahertz applications　　　　　　　　　　　　　　　
  H Myoren; MAJ Verhoeven; J Chen; K Nakajima; T Yamashita; DHA Blank; H Rogalla
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：8, Number：3, First page：132, Last page：136, Sep. 1998, [Reviewed]
  The authors successfully fabricated high-if, ramp-type junctions with PrBa2Cu3-xGa2O7-delta (PBCGO: x = 0.1, 0.4) barriers on MgO substrates, The junctions showed resistively shunted Josephson junction (RSJ)-like I-V curves with thermally and voltage activated conductivity. The IcRn products for these junctions scaled very well with the Ga-doping, Maximum response of the junctions for 100-GHz millimeter-wave irradiation could be observed up to 12 mV corresponding to 6 THz, Using far infrared laser radiation, we confirmed a terahertz (THz) response of these junctions. These results show promise for THz-wave applications of ramp-type Josephson junctions.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  ISSN：1051-8223, Web of Science ID：WOS:000075853000005
• THz mixing properties of YBa2Cu3O7−δ grain boundary Josephson junctions on bicrystal substrates　　　　　　　　　　　　　　　
  J. Chen; H. Myoren; K. Nakajima; T. Yamashita
  Physica C: Superconductivity, Volume：293, Number：1-4, First page：288, Last page：291, Dec. 1997, [Reviewed]
  Elsevier BV, Scientific journal
  DOI：https://doi.org/10.1016/s0921-4534(97)01559-1
  DOI ID：10.1016/s0921-4534(97)01559-1, ISSN：0921-4534
• Terahertz responses of high-Tc ramp-type junctions on MgO　　　　　　　　　　　　　　　
  H.Myoren, J.Chen, K.Nkajima, T.Yamashita, D.H.A.Blank, H.Rogalla
  Applied Superconductivity, First page：385, Last page：8, Dec. 1997
  Institute of Physics Publishing
• Mixing at terahertz frequency band using YBa2Cu3O7−δ bicrystal Josephson junctions
  J. Chen; H. Myoren; K. Nakajima; T. Yamashita; P. H. Wu
  Applied Physics Letters, Volume：71, Number：5, First page：707, Last page：709, Aug. 1997, [Reviewed]
  Using high-Tc Josephson junctions made of YBa2Cu3O7−δ deposited across MgO bicrystal boundary, at terahertz (THz) frequency band, we demonstrated both fundamental and harmonic mixing. Radiation from a far-infrared laser was coupled to the junction, which was integrated with a planar bow-tie antenna, via an extended hyperhemispherical silicon lens. Fundamental mixing manifested itself in the junction’s dc current–voltage (I–V) curve as a third Shapiro step in addition to those two induced by the THz laser lines from a slightly misaligned resonator. In harmonic mixing between a THz laser line and a microwave local oscillator, the highest harmonic number we could get was 490 with a signal-to-noise ratio of 9 dB at the intermediate frequency.
  AIP Publishing, Scientific journal
  DOI：https://doi.org/10.1063/1.119836
  DOI ID：10.1063/1.119836, ISSN：0003-6951, eISSN：1077-3118
• Josephson junction arrays on Si membrane using focused electron beam irradiation　　　　　　　　　　　　　　　
  S.-J. Kim; K. Nakajima; J. Chen; H. Myoren; T. Yamashita; M. Esashi
  Physica C: Superconductivity and its Applications, Volume：282-287, First page：2467, Last page：2468, Aug. 1997, [Reviewed]
  Elsevier BV, Scientific journal
  DOI：https://doi.org/10.1016/s0921-4534(97)01310-5
  DOI ID：10.1016/s0921-4534(97)01310-5, ISSN：0921-4534
• Terahertz response for bicrystal YBCO Josephson junctions
  K. Nakajima; Jian Chen; H. Myoren; T. Yamashita; Peiheng Wu
  IEEE Transactions on Appiled Superconductivity, Volume：7, Number：2, First page：2607, Last page：2610, Jun. 1997, [Reviewed]
  Institute of Electrical and Electronics Engineers (IEEE), Scientific journal
  DOI：https://doi.org/10.1109/77.621773
  DOI ID：10.1109/77.621773, ISSN：1051-8223
• Anisotropic resistivity of in-plane-aligned La 2-x SrxCuO4 /（100）films on LaSrGaO4（100）substrates　　　　　　　　　　　　　　　
  H. Myoren, R.Bergs, T.Tachiki, J.Chen, K. Nkajima, M.Suzuki, T.Yamashita, H.Sato, M. Naito
  Jpn. J. Appl. Phys., Volume：36, Number：5, First page：2642, Last page：5, May 1997, [Reviewed]
• Intrinsic noise temperatures of YBa2Cu3O7−δ Josephson devices on bicrystal substrates and the upper frequency limit for their operation
  J. Chen; H. Myoren; K. Nakajima; T. Yamashita; P. H. Wu
  Journal of Applied Physics, Volume：80, Number：11, First page：6536, Last page：6538, Dec. 1996, [Reviewed]
  Following a method proposed by Divin and Modovets [Sov. Tech. Phys. Lett. 9, 108 (1983)], we have measured at millimeter waveband the intrinsic noise temperatures TN of YBa2Cu3O7−δ Josephson junctions or dc superconducting quantum interference devices (SQUIDs) fabricated on SrTiO3, yttria-stabilized ZrO2, or Si bicrystal substrates. Over wide ranges of physical temperatures TP and the junction’s normal resistance RN, it was found that TN follows TP pretty well. This indicates that the intrinsic noise in the devices is dominated by Johnson noise. TN was also measured in cases where there is external magnetic field applied, or where there is another microwave radiation like the local oscillator in a mixer. The magnetic field or microwave radiation does not seem to affect TN in any appreciable way. To estimate the high frequency performance of the junctions on Si bicrystal substrates, direct irradiation by a far infrared laser at 1.81 THz is carried out and the clear first Shapiro step is observed.
  AIP Publishing, Scientific journal
  DOI：https://doi.org/10.1063/1.363672
  DOI ID：10.1063/1.363672, ISSN：0021-8979, eISSN：1089-7550
• Limiting performance of YBCO high-frequency Josephson devices
  J. Chen; H. Myoren; K. Nakajima; T. Yamashita
  Czechoslovak Journal of Physics, Volume：46, Number：S5, First page：2821, Last page：2822, May 1996, [Reviewed]
  Springer Science and Business Media LLC, Scientific journal
  DOI：https://doi.org/10.1007/bf02570397
  DOI ID：10.1007/bf02570397, ISSN：0011-4626, eISSN：1572-9486
• Successful fabrication of bicrystal Si substrates for YBa2Cu3O7 − y Josephson junctions　　　　　　　　　　　　　　　
  S.J. Kim; H. Myoren; J. Chen; K. Nakajima; T. Yamashita
  Cryogenics, Volume：35, Number：12, First page：901, Last page：903, Dec. 1995, [Reviewed]
  Elsevier BV, Scientific journal
  DOI：https://doi.org/10.1016/0011-2275(95)96889-t
  DOI ID：10.1016/0011-2275(95)96889-t, ISSN：0011-2275
• Field effects on the dielectric property of YBCO bicrystal grain boundary junctions
  K. Nakajima; K. Yokota; H. Myoren; J. Chen; T. Yamashita
  IEEE Transactions on Appiled Superconductivity, Volume：5, Number：2, First page：2861, Last page：2864, Jun. 1995, [Reviewed]
  Institute of Electrical and Electronics Engineers (IEEE), Scientific journal
  DOI：https://doi.org/10.1109/77.403188
  DOI ID：10.1109/77.403188, ISSN：1051-8223
• Epitaxial Growth and AFM Observation of YBCO/CeO₂/Al₂O₃ Films
  Yoshitaka Nakamura; Hitoshi Kohno; Shigetoshi Ohshima; Katsuro Okuyama; Hiroaki Myoren; Tsutomu Yamasita; Hisanori Yamane; Toshio Hirai
  IEEJ Transactions on Fundamentals and Materials, Volume：115, Number：3, First page：157, Last page：162, 1995, [Reviewed]
  Institute of Electrical Engineers of Japan (IEE Japan), Scientific journal
  DOI：https://doi.org/10.1541/ieejfms1990.115.3_157
  DOI ID：10.1541/ieejfms1990.115.3_157, ISSN：0385-4205, eISSN：1347-5533
• Low frequency (1/f) noise in YBa2Cu3O7−δ grain boundary junction dc superconducting quantum interference devices
  J. Chen; T. Ogawa; H. Nakamura; H. Myoren; K. Nakajima; T. Yamashita
  Journal of Applied Physics, Volume：76, Number：3, First page：1895, Last page：1898, Aug. 1994, [Reviewed]
  We have studied low frequency (1/f) noise of YBa2Cu3O7−δ dc superconducting quantum interference devices (SQUIDs) on SrTiO3 bicrystal substrates. 1/f flux noise, either measured at different temperatures for optimized bias current or measured at 77 K for different bias currents, is almost constant. These facts imply that 1/f noise mainly comes from fluctuations of the critical current of the Josephson junction that form the SQUID. Also, we explain the critical current fluctuations in the junction by an equilibrium temperature fluctuation model.
  AIP Publishing, Scientific journal
  DOI：https://doi.org/10.1063/1.357714
  DOI ID：10.1063/1.357714, ISSN：0021-8979, eISSN：1089-7550
• Electric Field Effects on YBa2Cu3O7-δ Grain Boundary Josephson Junctions　　　　　　　　　　　　　　　
  Nakajima Kensuke; Yokota Kazuki; Chen Jian; Myoren Hiroaki; Yamashita Tsutomu
  Jpn J Appl Phys, Volume：33, Number：7, First page：L934, Last page：L937, Jul. 1994, [Reviewed]
  Various effects of the electric field on YBa2Cu3O7-δ grain boundary Josephson junctions were studied using inverted metal-insulator-superconductor (MIS) samples which employed bicrystal SrTiO3 substrates as insulators. The critical cutrents, I c of the junctions were regulated by gate voltages with the field-induced changes in charge carrier densities. Furthermore, a significant field effect on equidistant step structures observed in I-V curves was found. The equidistant steps can be ascribed to self-resonances of the ac Josephson current in the grain boundary junctions. The gate voltages shifted the step voltages corresponding to resonance frequencies of the grain boundary toward high voltages. This appears to be a consequence of the field dependence of dielectric properties of grain boundary junctions.
  The Japan Society of Applied Physics, English
  DOI：https://doi.org/10.1143/JJAP.33.L934
  DOI ID：10.1143/JJAP.33.L934, ISSN：0021-4922, CiNii Articles ID：110003921915, CiNii Books ID：AA10650595
• Electric field effect on the artificial grain boundary of bicrystal YBa2Cu3O7−δ films
  Kensuke Nakajima; Kazuki Yokota; Hiroaki Myoren; Jian Chen; Tsutomu Yamashita
  Applied Physics Letters, Volume：63, Number：5, First page：684, Last page：686, Aug. 1993, [Reviewed]
  An ability of the artificial grain boundary of bicrystal YBa2Cu3O7−δ thin films is demonstrated as the field effect channel of high Tc field effect devices. The influence of field application on the channel resistance is examined with a metal-insulator-semiconductor-type structure, in which a channel is arranged across the grain boundary. The field-induced change in the resistance of the grain boundary is enhanced up to around 5% by lowering temperature below Tc of adjoining YBa2Cu3O7−δ grains. The enhancement is explained not only by an increase in the dielectric constant of the gate insulator (SrTiO3) but also by a reduction in the carrier density nearby the grain boundary. The latter is indeed a benefit to high Tc field effect devices.
  AIP Publishing, Scientific journal
  DOI：https://doi.org/10.1063/1.109929
  DOI ID：10.1063/1.109929, ISSN：0003-6951, eISSN：1077-3118
• YBCO ARTIFICIAL GRAN BOUNDARY JUNCTIONS ON Si　　　　　　　　　　　　　　　
  J. Chen; T. Yamashita; H. Suzuki; H. Myoren; K. Nakajima; Y. Osaka
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：3, Number：1, First page：2333, Last page：2336, Mar. 1993, [Reviewed]
  Si bicrystal substrates with different misorientation angles were fabricated using the hot-press method and their qualities were examined by SEM, TEM and XRD. YBa2Cu3O7-delta(YBCO) epitaxial thin films were grown on such substrates by rf magnetron sputtering, with yttria (Y2O3) and yttria-stabilized zirconia(YSZ) as the buffer layers. The properties of bridge type junctions patterned on the film by an excimer laser were studied from 4.2K to 77K It was found that the critical current density of the artificial grain boundary(AGB) junction (J(C)A) was always less than that of the junction made on Si single-crystal grains (J(C)G). The ratio J(C)A/J(C)G decreased exponentially as the misorientation angle(theta) was increased. The effect of temperature and microwave irradiation showed that the properties of AGB junctions with theta<5 degrees were limited by flux creep. In contrast, AGB junctions with theta >= 10 degrees showed the Josephson effect. Clear Shapiro steps and Josephson mixing were observed at 77K.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  ISSN：1051-8223, eISSN：1558-2515, Web of Science ID：WOS:000209703300130
• Infrared Polarized Reflection Spectra of SrTiO₃ Thin Films on Metal/Si
  Hiroaki Myoren; Takeshi Matsumoto Takeshi Matsumoto; Yukio Osaka Yukio Osaka
  Japanese Journal of Applied Physics, Volume：31, Number：10A, First page：L1425, Last page：L1425, Oct. 1992, [Reviewed]
  The dielectric properties in the infrared region of SrTiO₃ thin film on Pd/Si were studied using reflectance spectra of radiation polarized parallel to the incident plane. The absorption bands of LO (optical phonon) modes increase linearly with increasing incident angle. Maximum sensitivity can be obtained using an incident angle of about 60∼85°. There is sufficient sensitivity at the film thickness of less than 10 nm. These results suggest that p-polarized reflection spectroscopy is a promising technique for estimating dielectric properties for very thin SrTiO₃ films on metal/Si.
  IOP Publishing, Scientific journal
  DOI：https://doi.org/10.1143/jjap.31.l1425
  DOI ID：10.1143/jjap.31.l1425, ISSN：0021-4922, eISSN：1347-4065
• Visible Photoluminescence from Si Microcrystals Embedded in SiO₂ Glass Films
  Yukio Osaka; Keiji Tsunetomo; Fumitaka Toyomura; Hiroaki Myoren Kohno
  Japanese Journal of Applied Physics, Volume：31, Number：3B, First page：L365, Last page：L365, Mar. 1992, [Reviewed]
  We report the observation of an efficient visible photoluminescence (PL) from Si microcrystals embedded in SiO₂ glass films. The Si microcrystals were formed by the rf magnetron sputtering technique. The peak position of the PL spectra at 77 K shifts to a lower-energy side as the average diameter of the Si microcrystals increases.
  IOP Publishing, Scientific journal
  DOI：https://doi.org/10.1143/jjap.31.l365
  DOI ID：10.1143/jjap.31.l365, ISSN：0021-4922, eISSN：1347-4065
• APPEARANCE OF THREE-DIMENSIONAL SUPERCONDUCTING “VORTEX GLASS” IN Bi2Sr2CaCu2Ox THIN FILMS　　　　　　　　　　　　　　　
  Hiroaki MYOREN; Takatoshi ISHIKAWA; Yukio OSAKA
  Journal of Advanced Science, Volume：4, Number：2, First page：171, Last page：174,f2, 1992
  Society of Advanced Science, Scientific journal
  DOI：https://doi.org/10.2978/jsas.4.171
  DOI ID：10.2978/jsas.4.171, ISSN：0915-5651, eISSN：1881-3917
• SCREENING EFFECTS IN NORMAL STATES OF HIGH-Tc SUPERCONDUCTOR　　　　　　　　　　　　　　　
  Hiroaki MYOREN; Takatoshi ISHIKAWA; Yukio OSAKA
  Journal of Advanced Science, Volume：4, Number：1, First page：86, Last page：89,f3, 1992
  Society of Advanced Science, Scientific journal
  DOI：https://doi.org/10.2978/jsas.4.86
  DOI ID：10.2978/jsas.4.86, ISSN：0915-5651, eISSN：1881-3917
• C-V characteristics of AgMgO-high-Tc superconductor mis diode　　　　　　　　　　　　　　　
  Hiroaki Myoren; Takatoshi Ishikawa; Yukio Osaka
  Physica C: Superconductivity, Volume：185-189, First page：2529, Last page：2530, Dec. 1991, [Reviewed]
  Elsevier BV, Scientific journal
  DOI：https://doi.org/10.1016/0921-4534(91)91388-k
  DOI ID：10.1016/0921-4534(91)91388-k, ISSN：0921-4534
• Preparation and Properties of Ultrathin High-T_c Superconducting Films on Si
  Hiroaki Myoren; Kanji Harada; Aiko Miyamoto; Naokazu Miyamoto Naokazu Miyamoto; Yukio Osaka Yukio Osaka
  Japanese Journal of Applied Physics, Volume：30, Number：12S, First page：3896, Last page：3896, Dec. 1991, [Reviewed]
  Ultrathin Ba₂YCu₃O _x films with thickness down to 7 nm were grown epitaxially on a Si(100) substrate using buffer layers (Y₂O₃(10 nm) and YSZ(40 nm)). These films show metallic behavior and full superconductivity through revealing broadened transitions. The critical current densities at 40 K are about 5×10⁶ A/cm² and 5×10⁵ A/cm² for 100 nm- and 28 nm-thick films, respectively.
  IOP Publishing, Scientific journal
  DOI：https://doi.org/10.1143/jjap.30.3896
  DOI ID：10.1143/jjap.30.3896, ISSN：0021-4922, eISSN：1347-4065
• Nonlinear I-V Characteristics of Bi₂Sr₂CaCu₂O_x Thin Films
  Hiroaki Myoren; Takatoshi Ishikawa Takatoshi Ishikawa; Yukio Osaka Yukio Osaka
  Japanese Journal of Applied Physics, Volume：30, Number：9A, First page：L1553, Last page：L1553, Sep. 1991, [Reviewed]
  The nonlinear I-V characteristics in magnetic fields of 100 nm-thick Bi₂Sr₂CaCu₂O _x films on MgO(100) substrates were measured. In addition to the published results on YBa₂Cu₃O _x and Tl₂Ba₂CaCu₂O _x , the present measurement suggests that nonlinear I-V characteristics of high-T _c superconductors are universal and in agreement with a theoretical prediction based on a three-dimensional superconducting “vortex-glass” phase.
  IOP Publishing, Scientific journal
  DOI：https://doi.org/10.1143/jjap.30.l1553
  DOI ID：10.1143/jjap.30.l1553, ISSN：0021-4922, eISSN：1347-4065
• YBa₂Cu₃O_7-δ Angle Grain Boundary Junction on Si Bicrystal Substrate
  Jian Chen*; Tsutomu Yamashita; Hajime Suzuki; Kensuke Nakajima; Hideyuki Kurosawa; Yoshiharu Mutoh; Yoshihiko Hirotsu; Hiroaki Myoren; Yukio Osaka
  Japanese Journal of Applied Physics, Volume：30, Number：9R, First page：1964, Last page：1964, Sep. 1991, [Reviewed]
  Si bicrystal substrates with angle grain boundaries (AGB) have been fabricated for the first time by a diffusion bonding technique using the hot-press method. YBa₂Cu₃O_7-δ (YBCO) epitaxial thin films are grown on the Si bicrystal substrates with yttria (Y₂O₃) and yttria-stabilized zirconia (YSZ) buffer layers by rf magnetron sputtering. The properties of bridge-type junctions patterned by excimer laser have been studied from 4.2 K to 77 K and by microwave irradiation. It is found that the critical current density of the AGB junction (J _c ^A) is always less than that of either bridge made on single-crystal grains (J _c ^G). The effects of the temperature and microwave radiation show that the properties of the bridges on the grains are limited by flux creep. In contrast, the properties of the AGB junction with the angle larger than 10° show the Josephson effect.
  IOP Publishing, Scientific journal
  DOI：https://doi.org/10.1143/jjap.30.1964
  DOI ID：10.1143/jjap.30.1964, ISSN：0021-4922, eISSN：1347-4065
• Fabrication of All-High-T_c Josephson Junction Using As-Grown YBa₂Cu₃O_x Thin Films
  Kanji Harada; Hiroaki Myoren; Yukio Osaka
  Japanese Journal of Applied Physics, Volume：30, Number：8A, First page：L1387, Last page：L1387, Aug. 1991, [Reviewed]
  All-high-T _c Josephson junctions consisting of a YBCO/barrier/YBCO-layered structure using epitaxial YBCO films sputtered on MgO(100) have been successfully fabricated. The barrier layer was obtained by Ar+O₂ plasma treatment of the surface of the base electrodes. These junctions show superconductor/normal-metal/superconductor (SNS)-like current-voltage characteristics. Constant-voltage current steps observed in response to 10 GHz microwave radiation show that ac-Josephson effects occur in these junctions.
  IOP Publishing, Scientific journal
  DOI：https://doi.org/10.1143/jjap.30.l1387
  DOI ID：10.1143/jjap.30.l1387, ISSN：0021-4922, eISSN：1347-4065
• Crystalline Qualities and Critical Current Densities of As-Grown Ba₂YCu₃O_x Thin Films on Silicon with Buffer Layers
  Hiroaki Myoren; Yukio Nishiyama; Naokazu Miyamoto; Yasuaki Kai; Yasushi Yamanaka; Yukio Osaka; Fumitaka Nishiyama
  Japanese Journal of Applied Physics, Volume：29, Number：6A, First page：L955, Last page：L955, Jun. 1990, [Reviewed]
  As-grown Ba₂YCu₃O _x thin films (\lesssim100 nm) have been prepared by rf magnetron sputtering deposited on Si(100) with buffer layers of YSZ and Y₂O₃/YSZ. Epitaxial growth of Ba₂YCu₃O _x thin films is confirmed by ion channeling measurements along the (100) directions of the Si substrate showing a χ_min of 60% on YSZ/Si, and 6% on Y₂O₃/YSZ/Si using 2.0 MeV He⁺. The as-grown films have critical current densities of 10⁴ A/cm² on YSZ/Si and 10⁶ A/cm² on Y₂O₃/YSZ/Si at 77 K. Our results indicate that the superconducting properties of the films are limited primarily by the value of lattice mismatch between the Ba₂YCu₃O _x and buffer layers.
  IOP Publishing, Scientific journal
  DOI：https://doi.org/10.1143/jjap.29.l955
  DOI ID：10.1143/jjap.29.l955, ISSN：0021-4922, eISSN：1347-4065
• Josephson Effect in Wide Superconducting Bridges Made by Epitaxial Ba₂YCu₃O_x Thin Films on YSZ/Si(100)
  Hiroaki Myoren; Yukio Nishiyama; Naokazu Miyamoto; Yukio Osaka; Toshihiko Hamasaki
  Japanese Journal of Applied Physics, Volume：28, Number：12A, First page：L2213, Last page：L2213, Dec. 1989, [Reviewed]
  Using the silicon substrates patterned with the trench, the superconducting microbridge junction has been fabricated in as-grown Ba₂YCu₃O _x thin films by rf magnetron sputtering. The microbridge junctions with constrictions as small as submicron dimensions were obtained. These microbridge junctions behaved as Josephson junctions and microwave-induced steps were observed. The observed characteristics seem to be consistent with those expected for a homogeneous wide superconducting bridge (constriction size≫coherence length).
  IOP Publishing, Scientific journal
  DOI：https://doi.org/10.1143/jjap.28.l2213
  DOI ID：10.1143/jjap.28.l2213, ISSN：0021-4922, eISSN：1347-4065
• Bond-Angle Distribution of Sn Atom and ¹¹⁹Sn Mössbauer Spectroscopy in Hydrogenated Amorphous Silicon Doped by Sn
  Hiroaki Myoren; Yukio Osaka
  Japanese Journal of Applied Physics, Volume：28, Number：7R, First page：1165, Last page：1165, Jul. 1989, [Reviewed]
  The ¹¹⁹Sn Mössbauer spectral shape resulting from the bond-angle distribution of a Sn atom in a Si matrix is theoretically investigated. The application of this theory to the experiments on ¹¹⁹Sn Mössbauer spectroscopy of sputtered a-Si:H films shows that the generation of fewer overconstrained regions due to SiH₂ bonding configuration appreciably decreases the standard deviation σ of the bond angle deviation for the Sn atom. For sputtered a-Si:H films, the minimum value of σ is estimated to be 2.6°, which is mach smaller than the σ (≃7.7°) for the unhydrogenated films.
  IOP Publishing, Scientific journal
  DOI：https://doi.org/10.1143/jjap.28.1165
  DOI ID：10.1143/jjap.28.1165, ISSN：0021-4922, eISSN：1347-4065
• As-Grown Preparation of Superconducting Epitaxial Ba₂YCu₃O_x Thin Films Sputtered on Epitaxially Grown ZrO₂/Si(100)
  Hiroaki Myoren; Yukio Nishiyama; Hirofumi Fukumoto; Hiroyuki Nasu; Yukio Osaka
  Japanese Journal of Applied Physics, Volume：28, Number：3R, First page：351, Last page：351, Mar. 1989, [Reviewed]
  High-T _c superconducting Ba₂YCu₃O _x thin films have been epitaxially grown on Si(100) substrates with the epitaxially grown tetragonal ZrO₂ or cubic yttria-stabilized zirconia (YSZ) as a buffer layer. The thin films were prepared by rf magnetron sputtering of the stoichiometric Ba₂YCu₃O _x target below 700°C. An adequate positive substrate bias was necessary to ensure surface smoothness and to show the superconducting transition above liquid nitrogen temperature without any post-treatment. The highest T _c(onset) and T _c(end) observed were 88 K and 84 K, respectively.
  IOP Publishing, Scientific journal
  DOI：https://doi.org/10.1143/jjap.28.351
  DOI ID：10.1143/jjap.28.351, ISSN：0021-4922, eISSN：1347-4065
• Synthesis of Metastable Ge_xSn_1-x Alloys by Chemical Sputtering in H₂
  Kouichi Ishida; Hiroaki Myoren; Masaki Yamamoto; Takeshi Imura; Yukio Osaka
  Japanese Journal of Applied Physics, Volume：28, Number：1A, First page：L125, Last page：L125, Jan. 1989, [Reviewed]
  Thin films of metastable alloy Ge _x Sn_1-x (0≦x≦1) are formed by chemical sputtering in H₂ on glass and semiconducting crystalline substrates. X-ray diffraction indicates the formation of microcrystalline Ge _x Sn_1-x alloy films with a diamond structure. Ge _x Sn_1-x films deposited on InSb(x=0) and GaSb(x=0.47) substrates with lattice matches consist of polycrystals and are shown to have a crystal orientation nearly aligned to the substrate by RHEED observations. The chemical sputtering technique is appropriate for synthesizing Ge _x Sn_1-x alloys which might have potential as direct and narrow band gap materials.
  IOP Publishing, Scientific journal
  DOI：https://doi.org/10.1143/jjap.28.l125
  DOI ID：10.1143/jjap.28.l125, ISSN：0021-4922, eISSN：1347-4065
• Characterization of the structure in hydrogenated amorphous silicon by means of 119Sn Mössbauer spectroscopy　　　　　　　　　　　　　　　
  Hiroaki Myoren; Purushottam Shrestha; Takeshi Imura; Yukio Osaka
  Journal of Non-Crystalline Solids, Volume：97-98, First page：361, Last page：364, Dec. 1987, [Reviewed]
  Elsevier BV, Scientific journal
  DOI：https://doi.org/10.1016/0022-3093(87)90086-x
  DOI ID：10.1016/0022-3093(87)90086-x, ISSN：0022-3093
• Formation of α-Sn by chemical sputtering of β-Sn target in hydrogen plasma　　　　　　　　　　　　　　　
  Hirofumi Fukumoto; Hiroaki Myoren; Kazumi Matsumoto; Takeshi Imura; Yukio Osaka; Masaki Ichihara
  Solid State Communications, Volume：62, Number：4, First page：309, Last page：311, Apr. 1987, [Reviewed]
  Elsevier BV, Scientific journal
  DOI：https://doi.org/10.1016/0038-1098(87)90818-0
  DOI ID：10.1016/0038-1098(87)90818-0, ISSN：0038-1098
• Structural Changes of Amorphous Ge_1-xSn_x Alloy Films by Annealing
  Hirofumi Fukumoto; Hiroaki Myoren; Toshio Nakashita; Takeshi Imura; Yukio Osaka
  Japanese Journal of Applied Physics, Volume：25, Number：9R, First page：1312, Last page：1312, Sep. 1986, [Reviewed]
  Microcrystalline (µc-) grains of Ge_1-y Sn _y (0.1<y<0.4) were precipitated by thermal treatments of amorphous films of a Ge_1-x Sn _x (x<0.4) alloy deposited by co-sputtering. At higher temperatures grains of β-Sn came out, co-existing with those of µc-Ge_1-y Sn _y . Mössbauer spectroscopy was used to characterize states of Sn in a Ge-Sn alloy film. Optical properties, such as the real part ε ₁ of the complex dielectric constant for Ge_0.65Sn_0.35, also changed as the structure change, especially at a photon energy of 1.6∼1.8 eV, where ε ₁ took a maximum. It was suggested that an amorphous Ge-Sn alloy might be a good material for archival-type optical storage.
  IOP Publishing, Scientific journal
  DOI：https://doi.org/10.1143/jjap.25.1312
  DOI ID：10.1143/jjap.25.1312, ISSN：0021-4922, eISSN：1347-4065
• Low-Temperature Oxidation of Si-Sn alloy Films　　　　　　　　　　　　　　　
  Hirofumi FUKUMOTO; Hiroaki MYOREN; Takeshi IMURA; Yukio OSAKA
  SHINKU, Volume：29, Number：9, First page：434, Last page：438, 1986, [Reviewed]
  The Vacuum Society of Japan, Scientific journal
  DOI：https://doi.org/10.3131/jvsj.29.9_434
  DOI ID：10.3131/jvsj.29.9_434, ISSN：0559-8516, eISSN：1880-9413

• サブ磁束量子帰還型デジタルSQUIDのレイアウト設計　　　　　　　　　　　　　　　
  今谷純平、成瀬雅人、明連広昭
  電子情報通信学会技術研究報告, Volume：121, Number：340, First page：17, Last page：21, 2022
• Alpha-particle detection with airbridge implemented kinetic inductance detectors　　　　　　　　　　　　　　　
  五十嵐洋介; 成瀬雅人; 田井野徹; 明連広昭
  応用物理学会秋季学術講演会講演予稿集(CD-ROM), Volume：83rd, 2022
  ISSN：2758-4704, J-Global ID：202302252005973677
• Effect of line width and quality factor on energy resolution of kinetic inductance detectors　　　　　　　　　　　　　　　
  Nagaoka Jun; Ando Tomohiko; Naruse Masato; Taino Toru; Myoren Hiroaki
  JSAP Annual Meetings Extended Abstracts, Volume：2021.1, First page：1865, Last page：1865, 26 Feb. 2021
  The Japan Society of Applied Physics, Japanese
  DOI：https://doi.org/10.11470/jsapmeeting.2021.1.0_1865
  DOI ID：10.11470/jsapmeeting.2021.1.0_1865, eISSN：2436-7613
• Phase velocity control on a superconducting transmission line for sub-mm on-chip FTS　　　　　　　　　　　　　　　
  Yamaguchi Kouta; Naruse Masato; Taino Toru; Myoren Hiroaki
  JSAP Annual Meetings Extended Abstracts, Volume：2021.1, First page：1868, Last page：1868, 26 Feb. 2021
  The Japan Society of Applied Physics, Japanese
  DOI：https://doi.org/10.11470/jsapmeeting.2021.1.0_1868
  DOI ID：10.11470/jsapmeeting.2021.1.0_1868, eISSN：2436-7613
• Development of radiation camera with an array of 480 LEKIDs　　　　　　　　　　　　　　　
  Ninomiya Natsuko; Naruse Masato; Taino Toru; Myoren Hiroaki
  JSAP Annual Meetings Extended Abstracts, Volume：2021.1, First page：1867, Last page：1867, 26 Feb. 2021
  The Japan Society of Applied Physics, Japanese
  DOI：https://doi.org/10.11470/jsapmeeting.2021.1.0_1867
  DOI ID：10.11470/jsapmeeting.2021.1.0_1867, eISSN：2436-7613
• SFQ電流パルスによるトポロジカル量子ビットのブレイディング操作　　　　　　　　　　　　　　　
  船澤卓朗、成瀬雅人、明連広昭
  電子情報通信学会技術研究報告, Volume：121, Number：248, First page：6, Last page：9, 2021
• Development of superconducting radiation detectors embedded in air bridges　　　　　　　　　　　　　　　
  和賀雄貴; 成瀬雅人; 田井野徹; 明連広昭
  応用物理学会春季学術講演会講演予稿集(CD-ROM), Volume：68th, 2021
  ISSN：2758-4704, J-Global ID：202102257503684090
• Properties of substrate etched kinetic inductance detectors　　　　　　　　　　　　　　　
  Waga Yuki; Naruse Masato; Taino Tohru; Myoren Hiroaki
  JSAP Annual Meetings Extended Abstracts, Volume：2020.1, First page：2076, Last page：2076, 28 Feb. 2020
  The Japan Society of Applied Physics, Japanese
  DOI：https://doi.org/10.11470/jsapmeeting.2020.1.0_2076
  DOI ID：10.11470/jsapmeeting.2020.1.0_2076, eISSN：2436-7613
• Energy resolution independent of the linewidth of superconducting microresonators for alpha particle detectors　　　　　　　　　　　　　　　
  T. Ando, M. Naruse, T. Taino, H. Myoren
  電子情報通信学会技術研究報告, Volume：119, Number：369, First page：151, Last page：153, 16 Jan. 2020
  English
  ISSN：0913-5685, CiNii Articles ID：40022155941, CiNii Books ID：AN10012885
• Paralle SFQ Generator for Digital SQUID with Sub-SFQ feedback　　　　　　　　　　　　　　　
  I. Oshima, K. Itagaki, M. Naruse, T. Taino, H. Myoren
  電子情報通信学会技術研究報告, Volume：119, Number：369, First page：155, Last page：158, 2020
• High-Time Resolving Dynamic AND Array for Hong-Ou-Mandel Interference　　　　　　　　　　　　　　　
  Y. Hasegawa, M. Naruse, T. Taino, L. Kang, J. Chen, P. Wu, H. Myoren
  電子情報通信学会技術研究報告, Volume：119, Number：369, First page：159, Last page：162, 2020
• Digital SQUID Magnetometer for Airborne TEM　　　　　　　　　　　　　　　
  Hiroaki Myoren・Ryo Matsunawa・Kouki Itagaki・Itta Oshima・Yuki Hasegawa・Masato Naruse・Tohru Taino
  電子情報通信学会技術研究報告, Volume：119, Number：369, First page：169, Last page：171, 2020
• 並列SFQフィードバックを用いたデジタルSQUID磁束計の性能　　　　　　　　　　　　　　　
  大嶋一太、内田創坪、成瀬雅人、田井野 徹、明連広昭
  電子情報通信学会技術研究報告, Volume：120, Number：153, First page：27, Last page：30, 2020
• Design of High Timing resolution Time-to-Digital Convertor for Time-Resolving Photon Detection System using SNSPD　　　　　　　　　　　　　　　
  明連広昭・神谷遼太郎・會田晃太・成瀬雅人・田井野 徹(埼玉大)・康 琳・陳 健・呉 培亨
  電子情報通信学会技術研究報告, Volume：119, Number：219, First page：23, Last page：26, 09 Oct. 2019
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40022064450, CiNii Books ID：AN10012885
• 高Jcプロセスを用いたSFQ論理によるディジタルSQUID磁束計の性能評価　　　　　　　　　　　　　　　
  板垣航希・松縄 諒・大嶋一太・長谷川雄一・成瀬雅人・田井野 徹・明連広昭
  電子情報通信学会技術研究報告, Volume：119, Number：164, First page：49, Last page：53, 09 Aug. 2019
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021996943, CiNii Books ID：AN10012885
• Implementation of Digital Filter for Digital SQUID with sub-Flux Quantum Feedback Resolution　　　　　　　　　　　　　　　
  明連広昭・松繩 諒・板垣航希・大嶋一太・長谷川雄一・成瀬雅人・田井野 徹
  電子情報通信学会技術研究報告, Volume：119, Number：10, First page：33, Last page：38, 19 Apr. 2019
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021885399, CiNii Books ID：AN10012885
• Crosstalk evaluation of lumped element kinetic inductance detectors　　　　　　　　　　　　　　　
  桒田 正博; 成瀬 雅人; 田井野 徹; 明連 広昭
  Volume：118, Number：415, First page：1, Last page：5, 23 Jan. 2019
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021801129, CiNii Books ID：AN10012885
• サブ磁束量子フィードバックデジタルSQUID磁束計 : 高速化・小規模回路化に関する検討　　　　　　　　　　　　　　　
  板垣 航希, 大嶋 一太, 長谷川 雄一, 松縄 諒, 岡部 公亮, 成瀬 雅人, 田井野 徹, 明連 広昭
  電子情報通信学会技術研究報告, Volume：118, Number：415, First page：7, Last page：11, 23 Jan. 2019
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021801158, CiNii Books ID：AN10012885
• Comparison of photon-number-resolving detectors using superconducting nanowire　　　　　　　　　　　　　　　
  明連 広昭, 神谷 遼太郎, 傳田 哲史, 寺井 誠, 成瀬 雅人, 田井野 徹, 康 琳, 陳 健, 呉 培亨
  電子情報通信学会技術研究報告, Volume：118, Number：233, First page：7, Last page：12, 10 Oct. 2018
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021713682, CiNii Books ID：AN10012885
• Design of sub-Flux Quantum Feedback Digital SQUID Magnetometer with First-order Sinc Filter　　　　　　　　　　　　　　　
  松縄 諒, 岡部 公亮, 成瀬 雅人, 田井野 徹, 明連 広昭
  電子情報通信学会技術研究報告, Volume：118, Number：178, First page：13, Last page：17, 09 Aug. 2018
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021657530, CiNii Books ID：AN10012885
• Superconducting resonators relying on high-Tc materials for Gamma ray detectors　　　　　　　　　　　　　　　
  成瀬 雅人、久保田 立記、田井野 徹、明連 広昭
  電子情報通信学会技術研究報告, Volume：118, Number：11, First page：23, Last page：27, 20 Apr. 2018
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021538293, CiNii Books ID：AN10012885
• 超伝導信号処理による極低温検出器の高度化　　　　　　　　　　　　　　　
  明連広昭
  信学技報, Mar. 2018
• ニオブ超伝導共振器による放射線検出実験　　　　　　　　　　　　　　　
  安藤 友彦、成瀬 雅人、田井野 徹、明連 広昭
  電子情報通信学会技術研究報告, Volume：118, Number：178, First page：35, Last page：40, 2018
• サブ磁束量子フィードバックディジタルSQUID磁束計用ディジタルフィルターの設計　　　　　　　　　　　　　　　
  松縄 諒, 岡部公亮, 成瀬雅人, 田井野 徹, 明連広昭
  信学技報, Volume：117,428, First page：7, Last page：11, Jan. 2018
• Applications of high-speed photon-number-resolving SNSPD array　　　　　　　　　　　　　　　
  明連広昭, 大田一喜, 傳田哲史, 成瀬雅人, 田井野徹, 康 琳, 陳 健, 呉 培亨
  信学技報, Volume：117, Number：223, First page：23, Last page：28, 04 Oct. 2017
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021374188, CiNii Books ID：AN10012885
• Design of Digital SQUID using sub-SFQ Feedback with High Sampling Rate　　　　　　　　　　　　　　　
  岡部公亮, 成瀬雅人, 田井野 徹, 明連広昭
  信学技報, Volume：117, Number：171, First page：49, Last page：53, 09 Aug. 2017
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021317932, CiNii Books ID：AN10012885
• Design of Low-latency SFQ Up/Down Counter for Digital Signal Processing　　　　　　　　　　　　　　　
  神谷遼太郎, 成瀬雅人, 田井野 徹, 明連広昭
  信学技報, Volume：117, Number：171, First page：55, Last page：59, 09 Aug. 2017
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021317973, CiNii Books ID：AN10012885
• Design and Applications of Digital SQUID Magnetometer with Sub-Flux Quantum Feedback　　　　　　　　　　　　　　　
  明連広昭, 岡部公亮, 神谷遼太郎, 成瀬雅人, 田井野 徹
  信学技報, Volume：117, Number：10, First page：1, Last page：5, 21 Apr. 2017
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021187002, CiNii Books ID：AN10012885
• Photon-Number Resolving SNSPD Array with SFQ Amplifier Circuit　　　　　　　　　　　　　　　
  大田 一喜; 成瀬 雅人; 田井野 徹; 康 琳; 陳 健; 呉 培亨; 明連 広昭
  Volume：116, Number：269, First page：43, Last page：46, 26 Oct. 2016
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40020991413, CiNii Books ID：AN10012885
• Fabrication and Evaluation of Superconducting Tunnel Junctions with Embedded Coil for Applying Magnetic Field　　　　　　　　　　　　　　　
  酒井 功樹; 山口 兼司; 仲川 博; 青柳 昌宏; 成瀬 雅人; 明連 広昭; 田井野 徹
  Volume：116, Number：175, First page：5, Last page：8, 08 Aug. 2016
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40020932093, CiNii Books ID：AN10012885
• Improvement of fabrication and characterization for embedded STJ　　　　　　　　　　　　　　　
  森田 浩平; 松本 功; 青柳 昌宏; 成瀬 雅人; 明連 広昭; 田井野 徹
  Volume：116, Number：175, First page：9, Last page：12, 08 Aug. 2016
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40020932115, CiNii Books ID：AN10012885
• Development of the Radiation Detector Array Using High-temperature Superconductor　　　　　　　　　　　　　　　
  久保田 立記; 成瀬 雅人; 田井野 徹; 明連 広昭
  Volume：116, Number：175, First page：13, Last page：17, 08 Aug. 2016
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40020932118, CiNii Books ID：AN10012885
• NbN Parallel-Serial Type Superconducting Nanowire Single Photon Detector for High Speed Response　　　　　　　　　　　　　　　
  前田 優; 塩島 俊也; 成瀬 雅人; 田井野 徹; 明連 広昭
  Volume：116, Number：175, First page：41, Last page：44, 08 Aug. 2016
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40020932272, CiNii Books ID：AN10012885
• Development of Broadband Microstrip Crossover for Millimeter-Wave　　　　　　　　　　　　　　　
  増田 聖; 成瀬 雅人; 田井野 徹; 明連 広昭; 関本 裕太郎; 新田 冬夢
  Volume：116, Number：175, First page：25, Last page：28, 08 Aug. 2016
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40020932195, CiNii Books ID：AN10012885
• C-8-2 Digital SQUID using DROS Comparator with Relaxation Oscillation Circuit　　　　　　　　　　　　　　　
  Kobayashi Ryota; Naruse Masato; Taino Tohru; Myoren Hiroaki
  Proceedings of the IEICE General Conference, Volume：2016, Number：2, First page：30, Last page：30, 01 Mar. 2016
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110010026112, CiNii Books ID：AN10471452
• ミリ波帯用コプレナー導波路へのエアブリッジ構造の開発　　　　　　　　　　　　　　　
  伊藤和雅; 成瀬雅人; 田井野徹; 明連広昭; 関本裕太郎; 新田冬夢
  Volume：2016, 2016
  ISSN：1347-0639, J-Global ID：201602208492346974
• The development of the air-bridge structure of the coplanar waveguide for millimeter-wave band　　　　　　　　　　　　　　　
  伊藤和雅; 成瀬雅人; SHU Shibo; SHU Shibo; 関本裕太郎; 新田冬夢; 田井野徹; 明連広昭
  電子情報通信学会技術研究報告, Volume：116, Number：175(SCE2016 11-28), 2016
  ISSN：0913-5685, J-Global ID：201602262437671938
• Superconducting Microresonators for Gamma-ray Detection　　　　　　　　　　　　　　　
  NARUSE Masato; MIYAMOTO Noriaki; TAINO Tohru; MYOREN Hiroaki
  Technical report of IEICE. SCE, Volume：114, Number：247, First page：39, Last page：42, 15 Oct. 2014
  We propose a high spatial resolution gamma ray camera with superconducting resonator arrays for food screening systems. The gamma ray camera is composed of hundreds of microwave resonators. Absorbers are attached to the reverse side of the wafer. The gamma-rays create phonons in the absorber and the resonators detect the phonons propagated from the absorber. As a first step for the proposed camera, we measured 10 lumped element kinetic inductance detectors (LeKIDs) in a 0.3-K sorption cryostat. The event rate of the pixel with the Pb absorber was approximately 5 cps and 6 times higher than that of the pixel without the absorber. The rise and the fall time of events were less than the 1.1 MHz sampling of a vector network analyzer.
  The Institute of Electronics, Information and Communication Engineers, Japanese
  ISSN：0913-5685, CiNii Articles ID：110009959085, CiNii Books ID：AN10012885
• C-8-1 Design of Digital SQUID Magnetometer with sub-Flux Quantum Resolution　　　　　　　　　　　　　　　
  Takatoku Kouhei; Naruse Masato; Taino Tohru; Myoren Hiroaki
  Proceedings of the Society Conference of IEICE, Volume：2014, Number：2, First page：15, Last page：15, 09 Sep. 2014
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110009882127, CiNii Books ID：AN10489017
• C-8-14 Design of 8-bit low-energy SFQ Up/Down counter for Digital SQUID　　　　　　　　　　　　　　　
  Zhang Bing; Naruse Masato; Taino Tohru; Myoren Hiroaki
  Proceedings of the Society Conference of IEICE, Volume：2014, Number：2, First page：28, Last page：28, 09 Sep. 2014
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110009882210, CiNii Books ID：AN10489017
• Design of SFQ digital circuit for photon number resolving detector using SNSPD　　　　　　　　　　　　　　　
  TAKEDA Sunsuke; NARUSE Masato; TAINO Tohru; MYOREN Hiroaki; CHEN Jian; WU Peiheng
  Technical report of IEICE. SCE, Volume：113, Number：232, First page：83, Last page：87, 02 Oct. 2013
  Superconducting nanowire single photon detectors (SNSPDs), those have a low dark count rate characteristics, fast and low jittering response, and high quantum efficiency, are expected to be used in the quantum information field and time-of-flight (TOF) mass spectrometry etc. A readout circuit using superconducting single-flux-quantum (SFQ) logic circuits has been developed to realize fast and low-jittering readout for an array of SNSPDs. SNSPDs with series-parallel meander type configurations have been demonstrated to have photon number resolving capabilities and are expected to be used for an evaluation system of single photon generators and/or an energy-dissolved fast detector for new generation TOF mass spectrometry. In this study, we present design, fabrication and confirmation of correct operations of an SFQ digital readout circuit for an SNSPD with series-parallel meander type configuration.
  The Institute of Electronics, Information and Communication Engineers, Japanese
  ISSN：0913-5685, CiNii Articles ID：110009815147, CiNii Books ID：AN10012885
• Design of SFQ logic cells with magnetic shield structure for digital SQUID　　　　　　　　　　　　　　　
  Nakagawa Hironori; Naruse Masato; Taino Tohru; Myoren Hiroaki
  Proceedings of the Society Conference of IEICE, Volume：2013, Number：2, First page：25, Last page：25, 03 Sep. 2013
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110009735804, CiNii Books ID：AN10489017
• Design of SFQ circuit for photon number resolving detector using parallel SNSPD　　　　　　　　　　　　　　　
  Takeda Shunsuke; Naruse Masato; Taino Tohru; Myoren Hiroaki; Che Jian Che; Wu Peiheng
  Proceedings of the Society Conference of IEICE, Volume：2013, Number：2, First page：26, Last page：26, 03 Sep. 2013
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110009735805, CiNii Books ID：AN10489017
• Superconducting Micro-resonator arrays for High Sensitivity Terahertz-wave Cameras　　　　　　　　　　　　　　　
  NARUSE Masato; WATANABE Yoshiharu; NUNOKAWA Yuma; TAINO Tohru; MYOREN Hiroaki
  Technical report of IEICE. SCE, Volume：113, Number：11, First page：21, Last page：25, 19 Apr. 2013
  We have been developing terahertz cameras using superconducting micro-resonator arrays operated at 4K. A superconducting micro resonator, called Microwave Kinetic Inductance Detector(MKID), is one of the most sensitive detectors for terahertz wave. MKID is made from a Niobium Nitride films whose superconducting transition temperature is 15.7K with the thickness of 150nm. The film is deposited on an MgO substrate by magnetron sputtering method. To increase the number of detectors per area, we estimate the amount of microwave crosstalk between pixels with Ansys Designer. We find that the pixel crosstalk occurs by both inductive and capacitive coupling.
  The Institute of Electronics, Information and Communication Engineers, Japanese
  ISSN：0913-5685, CiNii Articles ID：110009768239, CiNii Books ID：AN10012885
• C-8-13 Time-Domain Multiplexing for STJ Array Detectors　　　　　　　　　　　　　　　
  Kobayashi Yuta; Sasaki Ryo; Naruse Masato; Taino Toru; Myoren Hiroaki
  Proceedings of the IEICE General Conference, Volume：2013, Number：2, First page：44, Last page：44, 05 Mar. 2013
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110009767082, CiNii Books ID：AN10471452
• 反射防止膜を用いたTHz波用STJ検出器の特性評価
  鈴木宏宣; 田井野徹; 有吉誠一郎; 大谷知行; 明連広昭
  応用物理学会学術講演会講演予稿集(CD-ROM), Volume：72nd, First page：ROMBUNNO.31A-W-9, 16 Aug. 2011
  Japanese
  J-Global ID：201102227274473899
• 分子線エピタキシー法によるエピタキシャル成長薄膜を用いた超伝導トンネル接合の作製
  濱尾俊幸; 有吉誠一郎; 田井野徹; 明連広昭; 古賀健祐; 大谷知行
  応用物理学会学術講演会講演予稿集(CD-ROM), Volume：72nd, First page：ROMBUNNO.31P-ZM-5, 16 Aug. 2011
  Japanese
  J-Global ID：201102262291396083
• 基板吸収型STJを用いた大面積THz波検出器
  山下直人; 青木一隆; 渡邉穣; 石井宏和; 田井野徹; 大谷知行; 澁谷孝幸; 有吉誠一郎; 佐藤広海; 明連広昭
  応用物理学会学術講演会講演予稿集, Volume：70th, Number：1, First page：286, 08 Sep. 2009
  Japanese
  J-Global ID：200902243020402735
• Superconducting Photon Detectors for Frontier Photonics　　　　　　　　　　　　　　　
  Myoren H., Taino T.
  he 1st International Forum on Frontier Photonics proceedings, First page：14, Last page：17, 2009
• 基板吸収型並列アレイSTJ検出器によるTHz波の検出
  青木一隆; 山下直人; 渡邉穣; 石井宏和; 田井野徹; 大谷知行; 渋谷孝幸; 有吉誠一郎; 佐藤広海; 明連広昭
  応用物理学会学術講演会講演予稿集, Volume：69th, Number：1, First page：249, 02 Sep. 2008
  Japanese
  J-Global ID：200902215279866337
• 超伝導トンネル接合検出器を用いたTHz波分光測定
  山下直人; 青木一隆; 渡邉穣; 石井宏和; 田井野徹; 大谷知行; 渋谷孝幸; 有吉誠一郎; 佐藤広海; 明連広昭
  応用物理学会学術講演会講演予稿集, Volume：69th, Number：1, First page：249, 02 Sep. 2008
  Japanese
  J-Global ID：200902293363389413
• 超伝導高速デジタル信号伝送技術に関する研究　　　　　　　　　　　　　　　
  明連 広昭
  総合研究機構研究プロジェクト研究成果報告書, Volume：第6号(平成19年度), Sep. 2008
  埼玉大学総合研究機構
• C-8-9 High Speed Operation of a Multiplexer for Superconducting Tunnel Junction Arrays　　　　　　　　　　　　　　　
  Yoshizawa Yu; Taino Tohru; Myoren Hiroaki; Takada Susumu
  Proceedings of the IEICE General Conference, Volume：2008, Number：2, First page：56, Last page：56, 05 Mar. 2008
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110006865619, CiNii Books ID：AN10471452
• 基板吸収型並列STJアレイ検出器によるTHz検出器の高感度化
  石井宏和; 田井野徹; 大谷知行; 渋谷孝幸; 有吉誠一郎; 佐藤広海; 明連広昭; 高田進
  応用物理学会学術講演会講演予稿集, Volume：68th, Number：1, First page：305, 04 Sep. 2007
  Japanese
  J-Global ID：200902238823361325
• C-8-4 Multiplexer for Superconducting Tunnel Junction Array　　　　　　　　　　　　　　　
  Yoshizawa Yu; Taino Tohru; Myoren Hiroaki; Takada Susumu
  Proceedings of the Society Conference of IEICE, Volume：2007, Number：2, First page：31, Last page：31, 29 Aug. 2007
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110006628994, CiNii Books ID：AN10489017
• 超伝導論理回路を用いた超伝導センサシステムの構築　　　　　　　　　　　　　　　
  明連 広昭
  第1回テクノ・カフェ : セミナー資料, First page：1, Last page：4, Feb. 2007
  埼玉大学総合研究機構地域共同研究センター
• 超伝導トンネル接合フォトン検出器の構造とその特性　　　　　　　　　　　　　　　
  田井野徹, 渡邉穣, 佐藤広海, 明連広昭, 高田進
  電子情報通信学会研究会資料, Volume：SCE2007-16, First page：23, Last page：26, 2007
• Al系超伝導トンネル接合素子の作製と評価　　　　　　　　　　　　　　　
  鎌田幸佑, 田井野徹, 佐藤広海, 明連広昭, 高田進
  電子情報通信学会研究会資料, Volume：SCE2007-28, First page：19, Last page：22, 2007
• Superconducting Tunnel Junction with Substrate Absorber for THz waves Detector　　　　　　　　　　　　　　　
  田井野徹; 石井宏和; 吉村正太; 明連広昭; 高田進; 大谷知行; 有吉誠一郎; 佐藤広海; 清水裕彦; 川瀬晃道
  電子情報通信学会技術研究報告, Volume：106, Number：403(ED2006 184-199), First page：53, Last page：57, 01 Dec. 2006
  Terahertz electromagnetic waves (THz waves) are very attractive features for various fields such as engineering, medical and sciences. We have developed superconducting tunnel junctions (STJs) for THz waves detector. Our proposed detectors utilize a substrate of the STJ. This is called phonon-mediated method. In this paper, we introduce the results of STJ for THz waves detector with phonon-mediate method.
  一般社団法人電子情報通信学会, Japanese
  ISSN：0913-5685, J-Global ID：200902265169918398, CiNii Articles ID：110006162469
• THz波検出のための基板吸収型STJ検出器の高感度化
  石井宏和; 吉村正太; 田井野徹; 明連広昭; 大谷知行; 渋谷孝幸; 有吉誠一郎; 佐藤広海; 延與秀人; 川瀬晃道; 高田進
  応用物理学会学術講演会講演予稿集, Volume：67th, Number：1, First page：260, 29 Aug. 2006
  Japanese
  J-Global ID：200902205818711509
• 先端物質によるフロンティアフォトニクス<研究成果報告>　　　　　　　　　　　　　　　
  鎌田 憲彦,明連 広昭,矢口 裕之,谷口 弘三
  埼玉大学紀要, 工学部, 第1部論文集, Volume：39, First page：138, Last page：142, Jul. 2006
  埼玉大学工学部
• MgO 基板上のエピタキシャルNb 薄膜を用いた超伝導トンネル接合検出器の作製　　　　　　　　　　　　　　　
  明連 広昭
  総合研究機構研究プロジェクト研究成果報告書, Volume：第4号(17年度), 2006
  埼玉大学総合研究機構
• 基板吸収型STJ素子のTHz波検出特性
  吉村正太; 中野蘭; 田井野徹; 明連広昭; 大谷知行; 渋谷孝幸; 有吉誠一郎; 佐藤広海; 清水裕彦; 川瀬晃道; 高田進
  応用物理学会学術講演会講演予稿集, Volume：66th, Number：1, First page：203, 07 Sep. 2005
  Japanese
  J-Global ID：200902289999395564
• 超伝導量子干渉素子アレイを用いた低雑音増幅器に関する研究<論文>　　　　　　　　　　　　　　　
  師岡 利光,明連 広昭,高田 進
  埼玉大学紀要, 工学部, 第1部論文集, Volume：1, Number：38, First page：6, Last page：13, Mar. 2005
  埼玉大学工学部
• ポリイミドを用いた低雑音フォトン検出器の作製　　　　　　　　　　　　　　　
  田井野徹, 成澤雅人, 吉田昌代, 明連広昭, 高田進, 仲川博, 菊地克弥, 青柳昌宏, 佐藤広海, 清水裕彦
  電気学会フィジカルセンサ研究会, Volume：PHS-05-14, First page：11, Last page：14, 2005
• STJアレー検出器からの周波数多重化による信号読み出し　　　　　　　　　　　　　　　
  浜本亘, 内藤拓朗, 田井野徹, 明連広昭, 高田進
  電子情報通信学会技術研究報告, Volume：SCE2005-15, First page：17, Last page：20, 2005
• 基板吸収型超伝導トンネル接合素子によるTHz波検出<論文>　　　　　　　　　　　　　　　
  中野 蘭,田井野 徹,明連 広昭,高田 進
  埼玉大学紀要, 工学部, 第1部論文集, Volume：1, Number：38, First page：18, Last page：21, 2005
  埼玉大学工学部
• Terahertz detector using a Nb-based superconducting tunnel junction　　　　　　　　　　　　　　　
  C. Otani; K. Hoshino; T. Taino; H. Myoren; R. Nakano; S. Ariyoshi; H. Sato; H. M. Shimizu; S. Takada; K. Kawase
  Conference Digest of the 2004 Joint 29th International Conference on Infrared and Millimeter Waves and 12th International Conference on Terahertz Electronics, First page：243, Last page：244, 01 Dec. 2004
  We have developed a terahertz (THz) radiation detector using a Nb-based superconducting tunnel junction (STJ). The STJ was fabricated on a stoichiometric LiNbO 3 substrate. The incident THz photons absorbed by the substrate generate THz phonons, and a substantial amount of the phonons are detected by the STJ. The detector is expected to be sensitive to a wideband THz/far-infrared radiation above the energy gap of the Mb superconductor. We radiated monochromatic nanosecond THz pulses with the repetition rate of 49 Hz, and detected the corresponding periodic signals for the 1.1-1.9 THz radiation. ©2004 IEEE.
  SCOPUS ID：20144386844
• 超伝導トンネル接合素子を用いた基板吸収型テラヘルツ波検出器の開発 (II)
  大谷知行; 田井野徹; 中野蘭; 明連広昭; 有吉誠一郎; 佐藤広海; 清水裕彦; 川瀬晃道
  応用物理学会学術講演会講演予稿集, Volume：65th, Number：3, First page：980, 01 Sep. 2004
  Japanese
  J-Global ID：200902203431997126
• Taトラップ層を用いたSTJ素子のX線検出特性　　　　　　　　　　　　　　　
  吉村正太, 中野蘭, 田井野徹, 明連広昭, 佐藤広海, 清水裕彦, 高田進
  信学技報, Volume：104373, 2004
• 基板吸収型STJを用いた広帯域フォトン検出器　　　　　　　　　　　　　　　
  星野耕一, 田井野徹, 明連広昭, 大谷知行, 佐藤広海, 川瀬晃道, 清水裕彦, 高田進
  信学技報, Volume：103592, 2004
• 非同期SFQアップダウンカウンタを用いたデジタルDROSの設計　　　　　　　　　　　　　　　
  梶田佳樹, 脇水佳弘, 明連広昭, 高田進
  信学技報, Volume：103592, First page：37, Last page：40, 2004
• β-Taトラッピング層をもつNb系超伝導トンネル素子を用いたフォトン検出器　　　　　　　　　　　　　　　
  明連広昭; 田井野徹; 高田進
  埼玉大学紀要, 工学部, Volume：37, Number：37, First page：3, Last page：8, 2004
  Japanese
  ISSN：0916-6394, CiNii Articles ID：40006332164, CiNii Books ID：AN00095740

• 理工学のための微分方程式　　　　　　　　　　　　　　　
  長沢, 壮之, [Joint work]
  Apr. 2014
  Japanese, Total pages：iv, 168p
  CiNii Books：http://ci.nii.ac.jp/ncid/BB1544851X
  ISBN：9784563011529, CiNii Books ID：BB1544851X
• 理工学のための微分積分　　　　　　　　　　　　　　　
  長沢, 壮之; 池口, 徹; 江頭, 信二; 小原, 哲郎; 重原, 孝臣; 明連, 広昭; 山本, 浩
  Apr. 2013
  Japanese, Total pages：vi, 263p
  CiNii Books：http://ci.nii.ac.jp/ncid/BB12454050
  ISBN：9784563004705, CiNii Books ID：BB12454050
• Oxide Insulating Thin Films for High-Tc Superconducting Applications　　　　　　　　　　　　　　　
  Editors Tomoyasu Inoue and Toyohiro Chikyow (Chapter 8, Hiroaki Myoren)
  2010
• 電気数学　　　　　　　　　　　　　　　
  吉田貞史、石谷義博、菊池昭彦、松田七美男、明連広昭、矢口裕之
  実教出版, 2008
  Total pages：328
  ISBN：9784407313178
• Oxide Thin Film Technology -Growth and Applications-　　　　　　　　　　　　　　　
  Editor-Tomoyasu Inoue Co-editor Toyohiro Chikyo
  Transworld Research Network
  Total pages：175

• 断熱量子磁束パラメトロン論理を用いたバイポーラ電源によるブレイディング操作回路の設計　　　　　　　　　　　　　　　
  清水 祐希; 前川 大空; 成瀬 雅人; Christopher Ayala; 明連 広昭
  Mar. 2025
  Oral presentation
• 超伝導検出器アレイの多重読み出しとデータ処理　　　　　　　　　　　　　　　
  千葉 悠雅; 成瀬 雅人; 市村 晃一; 石徹白 晃治; 明連 広昭
  Mar. 2025
  Oral presentation
• TiN薄膜を用いた集中定数力学インダクタンス検出器の高感度化　　　　　　　　　　　　　　　
  増岡 佑人; 成瀬 雅人; 明連 広昭
  Mar. 2025
  Oral presentation
• 超伝導伝送線路による周波数カウンターの原理検証　　　　　　　　　　　　　　　
  成瀬 雅人; 宮崎 大地; 山口 滉太; 明連 広昭
  Mar. 2025
  Poster presentation
• Design of an Initialization Circuit for 2π-Vortex in a Topological Junction Array　　　　　　　　　　　　　　　
  Yuki Shimizu; Masato Naruse; Hiroaki Myoren
  37th International Symposium on Superconductivity (ISS2024), Dec. 2024
  Oral presentation
• Superconducting bipolar current pulse generators for initialization and braiding operations in a topological Josephson junction array　　　　　　　　　　　　　　　
  Hiroaki Myoren; Yuki Shimizu; Masato Naruse; Christopher Lawrence Ayala
  17th Superconducting SFQ VLSI Workshop (SSV 2024), Oct. 2024
  Oral presentation
• 単一磁束量子論理による高速比較回路を用いた高速A/D変換回路の設計　　　　　　　　　　　　　　　
  伴 和樹; 成瀬雅人; 明連広昭
  Sep. 2024
• トポロジカル接合アレイへの2π-vortex 初期化回路の検討　　　　　　　　　　　　　　　
  清水 祐希; 成瀬 雅人; 明連 広昭
  Sep. 2024
• トポロジカル量子ビット用ブレイディング操作SFQ制御回路(2)　　　　　　　　　　　　　　　
  大場 来、清水 裕希、成瀬 雅人、明連 広昭
  Mar. 2024, [Domestic conference]
• 単一磁束量子論理によるMKID用低消費電力デジタル信号処理回路の設計　　　　　　　　　　　　　　　
  藤江 和輝, 成瀬 雅人, 明連 広昭
  Dec. 2023, [Domestic conference]
• SFQ logic circuits for Braiding Operations in a Topological Josephson Junction Array　　　　　　　　　　　　　　　
  Hiroaki Myoren, Takuro Funazawa, Kitaru Oba, Yuki Shimizu and Masato Naruse
  Nov. 2023, [International conference]
• Single Flux Quantum Logic Circuit for Photon-Number-Resolving SNSPD Array　　　　　　　　　　　　　　　
  H. Myoren, T. Funazawa, Y. Shimizu and M. Naruse
  Nov. 2023, [International conference]
• マヨラナ束縛状態のブレイディング操作用バイポーラ電源の設計　　　　　　　　　　　　　　　
  清水祐希, 明連広昭, 成瀬雅人
  Sep. 2023, [Domestic conference]
• トポロジカル量子ビット用ブレイディング操作SFQ制御回路　　　　　　　　　　　　　　　
  大場 来, 成瀬雅人, 明連広昭, 船澤卓朗
  Sep. 2023, [Domestic conference]
• Braiding Operations of Majorana Bound State controlled by SFQ Logic Circuit　　　　　　　　　　　　　　　
  Hiroaki Myoren, Takuro Funazawa, Kitaru Oba, Yuki Shimizu and Masato Naruse
  Sep. 2023, [Domestic conference]
• SFQ論理回路制御による電流パルス源を用いたトポロジカルジョセフソン接合アレイのブレイディング操作　　　　　　　　　　　　　　　
  船澤卓朗、清水祐希、成瀬雅人、明連広昭
  Mar. 2023, [Domestic conference]
• 単一磁束量子論理回路によるトポロジカル量子ビット用ブレイディング操作回路の設計　　　　　　　　　　　　　　　
  大場 来, 船澤 卓朗, 成瀬 雅人, 明連 広昭
  Dec. 2022, [Domestic conference]
• 力学インダクタンス検出器用フィルターバンク方式SFQ信号処理回路の設計　　　　　　　　　　　　　　　
  藤江 和輝, 成瀬 雅人, 明連 広昭
  Dec. 2022, [Domestic conference]
• ハードウェア記述言語を用いたデジタルSQUID磁束計のレイアウト設計　　　　　　　　　　　　　　　
  今谷 純平, 成瀬 雅人, 明連 広昭
  Dec. 2022, [Domestic conference]
• SFQ電流パルスによるトポロジカル量子ビットの量子操作　　　　　　　　　　　　　　　
  船澤卓朗、成瀬雅人、明連広昭
  Sep. 2022, [Domestic conference]
• サブ磁束量子帰還型デジタルSQUIDのレイアウト設計　　　　　　　　　　　　　　　
  今谷純平・成瀬雅人・明連広昭(埼玉大)
  電子情報通信学会技術研究報告, Jan. 2022, [Domestic conference]
• Braiding Operations for Topological Josephson Junction Array using SFQ Current Pulses　　　　　　　　　　　　　　　
  H. Myoren, T. Funazawa, and M. Naruse, Saitama Univ.
  ISS2021, Web, 30 Nov.-2 Dec. 2021, Dec. 2021, [International conference]
• デジタルSQUID 用スタック型SQUID 出力アンプの設計　　　　　　　　　　　　　　　
  内田 創坪, 今谷 純平,成瀬 雅人,明連 広昭(埼玉大)
  Dec. 2021, [Domestic conference]
• SNSPD 応答信号読み出し用低タイミングジッタDC/SFQ 回路の設計　　　　　　　　　　　　　　　
  佐々木 奨平, 成瀬 雅人, 明連 広昭(埼玉大)
  Dec. 2021, [Domestic conference]
• Design of SFQ Logic Circuit for Braiding Operations in Topological Josephson Junction Array　　　　　　　　　　　　　　　
  H. Myoren, T. Funazawa, and M. Naruse, Saitama Univ.
  Proceedings of SSV2021, Nov. 2021, [International conference]
• SFQ電流パルスによるトポロジカル量子ビットのブレイディング操作　　　　　　　　　　　　　　　
  船澤卓朗・成瀬雅人・明連広昭(埼玉大)
  電子情報通信学会技術研究報告, Nov. 2021, [Domestic conference]
• 力学インダクタンス検出器のエネルギー分解能における線幅とQ値の影響　　　　　　　　　　　　　　　
  永岡 惇、安藤 智彦、成瀬 雅人、田井野 徹、明連 広昭
  第68回応用物理学会春季学術講演会予稿集, Mar. 2021, [Domestic conference]
• 480素子LEKIDアレイによる放射線カメラの開発　　　　　　　　　　　　　　　
  二宮 夏子、成瀬 雅人、田井野 徹、明連 広昭
  第68回応用物理学会春季学術講演会予稿集, Mar. 2021, [Domestic conference]
• NbNナノワイヤ直列アレイを用いた光子数検出器の臨界電流均一性　　　　　　　　　　　　　　　
  山澤 大樹、成瀬 雅人、明連 広昭
  第68回応用物理学会春季学術講演会予稿集, Mar. 2021, [Domestic conference]
• Design of SFQ Dynamic AND Gate Array for Time-Resolving Photon Detection System using SNSPDs　　　　　　　　　　　　　　　
  Hiroaki Myoren, Yuki Hasegawa, Masato Naruse, Tohru Taino, Lin Kang, Jian Chen, and Peiheng Wu
  Nov. 2020, [International conference]
• Effects of linewidth and quality factor on kinetic inductance detectors for alpha-rays　　　　　　　　　　　　　　　
  M. Naruse, T. Ando, Y. Waga, N. Ninomiya, T. Taino, H. Myoren
  Nov. 2020, [International conference]
• NbN薄膜を用いた集中定数力学インダクタンス検出器の作製　　　　　　　　　　　　　　　
  栄元雄山・成瀬雅人・田井野 徹・明連広昭
  Nov. 2020, [Domestic conference]
• 暗黒物質探索用LEKIDの作製に関する研究　　　　　　　　　　　　　　　
  河村 優貴、美馬 覚、大谷 知行、石徹白 晃治、Mohamado Zulfakri、細川 佳志、成瀬 雅人、明連 広昭、田井野 徹
  第81回応用物理学会秋季学術講演会予稿集, Sep. 2020, [Domestic conference]
• Nb-MKIDの作製方法の比較とNb薄膜の特性のQ値に対する相関の考察　　　　　　　　　　　　　　　
  伊藤 凌太、美馬 覚、大谷 知行、成瀬 雅人、明連 広昭、田井野 徹
  第81回応用物理学会秋季学術講演会予稿集, Sep. 2020, [Domestic conference]
• 3次元実装構造を持つX線検出器のアレイ化に向けた超伝導バンプアレイの電気的評価　　　　　　　　　　　　　　　
  三友 歩、仲川 博、青柳 昌宏、菊地 克弥、明連 広昭、成瀬 雅人、田井野 徹
  第81回応用物理学会秋季学術講演会予稿集, Sep. 2020, [Domestic conference]
• STJアレイ検出器用テーパー型超伝導TSVの作製と評価　　　　　　　　　　　　　　　
  石塚 亮、青柳 昌宏、美馬 覚、大谷 知行、成瀬 雅人、明連 広昭、田井野 徹
  第81回応用物理学会秋季学術講演会予稿集, Sep. 2020, [Domestic conference]
• メンブレンを用いたSTJ検出器のノイズ低減に関する研究　　　　　　　　　　　　　　　
  柴崎 太我、藤井 剛、浮辺 雅宏、菊地 貴大、成瀬 雅人、明連 広昭、田井野 徹
  第81回応用物理学会秋季学術講演会予稿集, Sep. 2020, [Domestic conference]
• 並列SFQフィードバックを用いたデジタルSQUID磁束計の性能　　　　　　　　　　　　　　　
  大嶋一太・内田創坪・成瀬雅人・田井野 徹・明連広昭
  Sep. 2020, [Domestic conference]
• SNSPD用高時間分解能SFQ信号処理回路の設計　　　　　　　　　　　　　　　
  長谷川雄一・佐々木奨平・成瀬雅人・田井野 徹(埼玉大)・康 琳・陳 健・呉 培亨(南京大)・明連広昭(埼玉大)
  Sep. 2020, [Domestic conference]
• Nb/Bi2Te3/Nb接合とBi2Te3トポロジカル絶縁体薄膜中のキャリア分布　　　　　　　　　　　　　　　
  明連 広昭, Stehno Martin, Ngabonziza Prosper, Brinkman Alexander
  第67回応用物理学会春季学術講演会予稿集, Mar. 2020, [Domestic conference]
• 基板加工した力学インダクタンス検出器の特性評価　　　　　　　　　　　　　　　
  和賀 雄貴, 成瀬 雅人, 田井野 徹, 明連 広昭
  第80回応用物理学会秋季学術講演会予稿集, Mar. 2020, [Domestic conference]
• SiO2を除去したSTJ X線検出器の評価　　　　　　　　　　　　　　　
  水野 玄也, 藤井 剛, 浮辺 雅宏, 志岐 成友, 成瀬雅人, 明連 広昭, 田井野 徹
  第80回応用物理学会秋季学術講演会予稿集, Mar. 2020, [Domestic conference]
• 航空機搭載型TEM用デジタルSQUID磁束計　　　　　　　　　　　　　　　
  明連広昭・松繩 諒・板垣航希・成瀬雅人・田井野 徹
  2020年電子情報通信学会総合大会予稿集, Mar. 2020, [Domestic conference]
• High-Time Resolving Dynamic AND Array for Hong-Ou-Mandel Interference　　　　　　　　　　　　　　　
  Y. Hasegawa, M. Naruse, T. Taino, L. Kang, J. Chen, P. Wu, H. Myoren
  Proceedings of SSV2020, Jan. 2020, [International conference]
• Paralle SFQ Generator for Digital SQUID with Sub-SFQ feedback　　　　　　　　　　　　　　　
  I. Oshima, K. Itagaki, M. Naruse, T. Taino, H. Myoren
  Proceedings of SSV2020, Jan. 2020, [International conference]
• Energy Resolution Independent of the Linewidth of Superconducting Microresonators for Alpha Particle Detectors　　　　　　　　　　　　　　　
  T. Ando, M. Naruse, T. Taino, H. Myoren
  Proceedings of SSV2020, Jan. 2020, [International conference]
• Digital SQUID Magnetometer for Airborne TEM　　　　　　　　　　　　　　　
  H. Myoren, R. Matsunawa, K. Itagaki, I. Oshima, Y. Hasegawa, M. Naruse, T. Taino
  Proceedings of SSV2020, Jan. 2020, [International conference]
• Implementation of interface circuit for Digital SQUID with sub-Flux Quantum Feedback Resolution　　　　　　　　　　　　　　　
  Ryo Matsunawa, Kohki Itagaki, Itta Oshima, Yuichi Hasegawa, Masato Naruse, Tohru Taino, Hiroaki Myoren
  ISS2019, Kyoto・Japan, 3-5 Dec. 2019, Dec. 2019, [International conference]
• Performance of Digital SQUID with Sub- - Flux Quantum Feedback Resolution fabricated using 10 kA/cm 2 2 Nb process　　　　　　　　　　　　　　　
  Kohki Itagaki, Itta Oshima, Yuichi Hasegawa, Ryo Matsunawa, Masato Naruse, Tohru Taino, Hiroaki Myoren
  ISS2019, Kyoto・Japan, 3-5 Dec. 2019, Dec. 2019, [International conference]
• High-Resolution Digital SQUID Magnetometer using Sub-Flux Quantum Feedback　　　　　　　　　　　　　　　
  Hiroaki Myoren, Kosuke Okabe, Ryo Matsunawa, Kohki Itagaki, Masato Naruse, and Tohru Taino
  EUCAS2019, Glasgow・UK,1-5 Sept. 2019, Sep. 2019, [Domestic conference]
• 埋め込み型STJのリーク電流低減に関する研究　　　　　　　　　　　　　　　
  伊藤 佑一郎, 成瀬 雅人, 明連 広昭, 青柳 昌宏,大谷 知行, 田井野 徹
  第80回応用物理学会秋季学術講演会予稿集, Sep. 2019, [Domestic conference]
• 3次元実装構造を持つX線検出器に向けたPb-In合金超伝導バンプの表面評価　　　　　　　　　　　　　　　
  林 佑樹, 仲川 博, 青柳 昌宏, 菊地 克弥, 成瀬 雅人, 明連 広昭, 田井野 徹
  第80回応用物理学会秋季学術講演会予稿集, Sep. 2019, [Domestic conference]
• アパーチャー実装によるSTJ X線検出器の高性能化　　　　　　　　　　　　　　　
  水野 玄也, 藤澤 優一, 藤井 剛, 浮辺 雅宏,志岐 成友, 成瀬 雅人, 明連 広昭, 田井野 徹
  第80回応用物理学会秋季学術講演会予稿集, Sep. 2019, [Domestic conference]
• 集中定数型力学インダクタンス検出器のクロストーク低減　　　　　　　　　　　　　　　
  桒田正博、成瀬雅人、田井野徹、明連広昭
  第66回応用物理学会春季学術講演会予稿集, Mar. 2019, [Domestic conference]
• ニオブ超伝導共振器による放射線検出実験　　　　　　　　　　　　　　　
  安藤友彦、明連広昭、成瀬雅人、田井野徹
  第66回応用物理学会春季学術講演会予稿集, Mar. 2019, [Domestic conference]
• Ti抵抗でシャントしたNbNナノワイヤ直列アレイを用いた光子数検出器　　　　　　　　　　　　　　　
  傳田哲史、成瀬雅人、田井野徹、明連広昭
  第66回応用物理学会春季学術講演会予稿集, Mar. 2019, [Domestic conference]
• サブ磁束量子フィードバックデジタルSQUID磁束計用デジタル信号処理回路　　　　　　　　　　　　　　　
  明連広昭、田井野徹、成瀬雅人、岡部公亮、松縄諒
  2019年電子情報通信学会総合大会講演論文集, Mar. 2019, [Domestic conference]
• Digital SQUID with Sub-Flux Quantum Feedback Resolution Using Multi-Flux Quantum Drivers and T2-FF Cells　　　　　　　　　　　　　　　
  H. Myoren, K. Okabe, K. Itagaki, R. Matsunawa, I. Oshima, Y. Hasegawa, M. Naruse, and T. Taino
  Proc. of 12th Superconductive SFQ VLSI Workshop, Jan. 2019, [International conference]
• Photon-Number Resolving Detector using Series Array of NbN Nanowire Shunted with Ti Resistors　　　　　　　　　　　　　　　
  Satoshi Denda, Masato Naruse, Tohru Taino, Hiroaki Myoren
  Ext. Abst. of International Symposium on Superconductivity 2018, Dec. 2018, [International conference]
• Development of High Throughput X-ray detectors using Superconducting Tunnel Junctions with a large area size　　　　　　　　　　　　　　　
  Yuichi Fujisawa, Go Fujii, Masahiro Ukibe, Shigetomo Shiki, Masato Naruse, Hiroaki Myoren, Tohru Taino
  Ext. Abst. of International Symposium on Superconductivity 2018, Dec. 2018, [International conference]
• Design of Digital Filter for Digital SQUID with sub-Flux Quantum Feedback Resolution　　　　　　　　　　　　　　　
  Hiroaki Myoren, Kousuke Okabe, Ryo Matsunawa, Masato Naruse and Toru Taino
  Ext. Abst. of 2018 Applied Superconductivity Conference, Oct. 2018, [International conference]
• 超伝導トンネル接合X線検出器のアパーチャーサイズの最適化によるエネルギー分解能の向上　　　　　　　　　　　　　　　
  藤澤優一、藤井剛、浮辺雅宏、志岐成友、成瀬雅人、明連広昭、田井野徹
  第79回応用物理学会秋季学術講演会予稿集, Sep. 2018, [Domestic conference]
• Read-out Circuit Based on SFQ Logic Circuit for Photon-Number-Resolving SNSPD Array　　　　　　　　　　　　　　　
  H. Myoren, K. Ota, S. Denda, M. Naruse, T. Taino, J. Chen and P. Wu
  Ext. Abs. 13th European Conference on Applied Superconductivity, Sep. 2017, [International conference]
• 3次元実装構造STJ用テーパー型超伝導TSVの作製と評価　　　　　　　　　　　　　　　
  門前和紗,畠山聡起,成瀬雅人,明連広昭,青柳昌宏,田井野徹
  第78回応用物理学会秋季学術講演会予稿集, Sep. 2017, [Domestic conference]
• 超伝導バンプを用いたSTJ検出器のフリップチップ実装技術　　　　　　　　　　　　　　　
  畠山聡起,仲川博,菊池克弥,青柳昌宏,明連広昭,田井野徹
  第78回応用物理学会秋季学術講演会予稿集, Sep. 2017, [Domestic conference]
• 基板吸収型STJ検出器におけるフォノン拡散長に関する研究　　　　　　　　　　　　　　　
  佐藤佑真,曽根雅彦,成瀬雅人,明連広昭,佐々木芳彰,大谷知行,田井野徹
  第78回応用物理学会秋季学術講演会予稿集, Sep. 2017, [Domestic conference]
• Si-LBOハイブリッド基板上中性子検出器用STJのX線照射試験　　　　　　　　　　　　　　　
  藤澤優一,遠藤荘,藤井剛,浮辺雅宏,倉島優一,高木秀樹,大久保雅隆,成瀬雅人,明連広昭,大谷知行,田井野徹
  第78回応用物理学会秋季学術講演会予稿集, Sep. 2017, [Domestic conference]
• 並列型超伝導ナノワイヤ直列アレイによる高速光子数検出器の作製　　　　　　　　　　　　　　　
  傳田哲史, 成瀬雅人, 田井野 徹, 明連広昭
  2017年電子情報通信学会ソサイエティ大会講演論文集, Sep. 2017, [Domestic conference]
• 光子数分解能を有するSNSPD検出器アレイ用SFQ増幅回路の動作　　　　　　　　　　　　　　　
  大田一喜、成瀬雅人、田井野 徹、Lin Kang、Jian Chen、Peiheng Wu、明連広昭
  2017年総合大会講演論文集, Mar. 2017, [Domestic conference]
• 単一磁束量子増幅器を用いた超伝導ナノワイヤ単一光子検出器アレイによる光子数検出　　　　　　　　　　　　　　　
  大田一樹、成瀬雅人、田井野徹、康琳、陳健、呉培亭、明連広昭
  信学技報, Oct. 2016, [Domestic conference]
• Read-out Circuit Based on SFQ Logic Circuit for Photon-Number-Resolving SNSPD Array　　　　　　　　　　　　　　　
  Hiroaki Myoren
  Ext. Abs. Plasma+2016, Oct. 2016, [International conference]
• Noise Properties of Digital SQUID Using Double Relaxation Oscillation SQUID Comparator With Relaxation Oscillation Resonant Circuit　　　　　　　　　　　　　　　
  Myoren, Hiroaki and Kobayashi, Ryota and Kumagai, Kenji and Naruse, Masato and Taino, Tohru
  Ext. Abs. ASC 2016, Sep. 2016, [International conference]
• 表面活性化常温接合による Si-LBO ハイブリッド基板構造を有する中性子検出用 STJ の作製　　　　　　　　　　　　　　　
  遠藤 壮、藤井 剛、浮辺 雅宏、高木 秀樹、大久保 雅隆、成瀬 雅人、明連 広昭、大谷 知行、田井野 徹
  第77回応用物理学会秋季学術講演会講演予稿集, Sep. 2016, [Domestic conference]
• 位置分解能を有する基板吸収型 STJ 検出器を用いた THz 波検出　　　　　　　　　　　　　　　
  曽根 雅彦、成瀬 雅人、明連 広昭、佐々木 芳彰、大谷 知行、田井野
  第77回応用物理学会秋季学術講演会講演予稿集, Sep. 2016, [Domestic conference]
• 3 次元実装構造を有する STJ のための超伝導 TSV 作製方法　　　　　　　　　　　　　　　
  森田 浩平、畠山 聡起、成瀬 雅人、明連 広昭、青柳 昌宏、田井野 徹
  第77回応用物理学会秋季学術講演会講演予稿集, Sep. 2016, [Domestic conference]
• CMB 偏光観測に向けた超伝導検出器の大規模アレイの開発　　　　　　　　　　　　　　　
  古谷野 凌、瀬本 宗久、美馬 覚、木内 健司、成瀬 雅人、明連 広昭、大谷 知行、田島 治、小栗 秀悟、田井野 徹
  第77回応用物理学会秋季学術講演会講演予稿集, Sep. 2016, [Domestic conference]
• 位置分解能を有する基板吸収型STJによるTHz波検出　　　　　　　　　　　　　　　
  曽根雅彦、五十嵐直樹、成瀬雅人、明連広昭、佐々木芳彰、大谷知行、田井野 徹
  信学技報, Aug. 2016, [Domestic conference]
• 高温超伝導体を用いた放射線検出器アレイの開発　　　　　　　　　　　　　　　
  久保田立記、成瀬雅人、田井野 徹、明連広昭
  信学技報, Aug. 2016, [Domestic conference]
• 3 次元実装構造を有する STJ のフリップチップ接続に関する研究　　　　　　　　　　　　　　　
  畠山 聡起、森田 浩平、根本 俊介、菊地 克弥、仲川 博、青柳 昌宏、成瀬 雅人、明連 広昭、田井野 徹
  第77回応用物理学会秋季学術講演会講演予稿集, Aug. 2016, [Domestic conference]
• ミリ波帯用コプレーナ導波路へのエアブリッジ構造の開発　　　　　　　　　　　　　　　
  伊藤和雅、成瀬雅人、Sho Shibo、関本祐太郎、新田冬夢、田井野 徹、明連広昭
  信学技報, Aug. 2016, [Domestic conference]
• NbN並列-直列型超伝導ナノワイヤによる単一光子検出器の高速応答　　　　　　　　　　　　　　　
  前田 優、塩島俊也、成瀬雅人、田井野 徹、明連広昭
  信学技報, Aug. 2016, [Domestic conference]
• Noise Performance of Digital SQUID Magnetometer Using DROS Comparator　　　　　　　　　　　　　　　
  H.Myoren, R.Kobayashi, K.Kumagai, M.Naruse and T.Taino
  Proc. Superconducting SFQ VLSI Workshop, Aug. 2016, [International conference]
• Properties of Gate-Tunable Nb/Bi2Te3/Nb Josephson Junctions　　　　　　　　　　　　　　　
  Hiroaki Myoren, Prosper Ngabonziza, Martin, P Stehno, Alexander Brinkman
  第６３回応用物理学会春季学術講演会予稿集, Mar. 2016, [Domestic conference]
• Optical Performances of a Superconducting On-Chip Spectrometer Camera for Millimeterwave Observations　　　　　　　　　　　　　　　
  Keiichi Arai, Masato Naruse, Satoru Mima, Chiko Otani, Tohru Taino, Hiroaki Myoren
  第６３回応用物理学会春季学術講演会予稿集, Mar. 2016, [Domestic conference]
• Propose of Photon Number-Resolving Photon Detector using Superconducting Nanowire Single Photon Detectors with Low Current Bias Regime　　　　　　　　　　　　　　　
  Toshiya Shiojima, Masato Naruse, Tohru Taino, Hiroaki Myoren
  第６３回応用物理学会春季学術講演会予稿集, Mar. 2016, [Domestic conference]
• 光子数識別SNSPD用SFQアップダウンカウンターの設計　　　　　　　　　　　　　　　
  熊谷賢司, 成瀬雅人, 田井野 徹, 明連広昭
  2016年総合大会講演論文集, Mar. 2016, [Domestic conference]
• 弛張振動共振回路を結合したDROS比較器を用いたデジタルSQUID　　　　　　　　　　　　　　　
  小林亮太, 成瀬雅人, 田井野 徹, 明連広昭
  2016年総合大会講演論文集, Mar. 2016, [Domestic conference]
• 光子数分解能を有するSNSPD検出器アレイ用SFQ増幅回路　　　　　　　　　　　　　　　
  大田一喜, 成瀬雅人, 田井野 徹, 明連広昭, Jian Chen, Lin Kang, Peiheng Wu
  2016年総合大会講演論文集, Mar. 2016, [Domestic conference]
• Fabrication of Superconducting Tunnel Junctions with Embedded Coil for Applying Magnetic Field　　　　　　　　　　　　　　　
  Kenji Yamaguchi, Hiroshi Nakagawa, Masahiro Aoyagi, Masato Naruse, Hiroaki Myoren, Tohru Taino
  Ext. Abs ISS2016, Nov. 2015, [International conference]
• The Improvement of the Spatial Resolution using the Substrate Absorption Type STJ for THz Detector　　　　　　　　　　　　　　　
  Naoki Igarashi, Masahiko Sone, Masato Naruse, Hiroaki Myoren, Yoshiaki Sasaki, Chiko Otani, Tohru Taino
  Ext. Abs ISS2016, Nov. 2015, [International conference]
• Improvement of Fabrication and Characterization for Embedded STJ　　　　　　　　　　　　　　　
  Isao Matsumoto, Kohei Morita, Masahiro Aoyagi, Masato Naruse, Hiroaki Myoren, Tohru Taino
  Ext. Abs ISS2016, Nov. 2015, [International conference]
• Fabrication of TiN/AlN/TiN Tunnel Junction　　　　　　　　　　　　　　　
  Takeru Nakayama, Masato Naruse, Hiroaki Myoren, Tohru Taino
  Ext. Abs ISS2016, Nov. 2015, [International conference]
• Fabrication of TiN/AlN/TiN Junction　　　　　　　　　　　　　　　
  Takeru Nakayama, Tohru Taino, Hiroaki Myoren, Masato Naruse
  第７６回応用物理学会秋季学術講演会予稿集, Sep. 2015, [Domestic conference]
• Fabrication of superconducting tunnel junctions with embedded coil for applying magnetic field　　　　　　　　　　　　　　　
  Kenji Yamaguchi, Masato Naruse, Hiroaki Myoren, Hiroshi Nakagawa, Masahiro Aoyagi, Tohru Taino
  第７６回応用物理学会秋季学術講演会予稿集, Sep. 2015, [Domestic conference]
• Improvement of fabrication and characterization for embedded STJ　　　　　　　　　　　　　　　
  Isao Matsumoto, Kohei Morita, Masato Naruse, Hiroaki Myoren, Masahiro Aoyagi, Tohru Taino
  第７６回応用物理学会秋季学術講演会予稿集, Sep. 2015, [Domestic conference]
• Fabrication of STJ for neutron detector　　　　　　　　　　　　　　　
  So Endo, Masato Naruse, Hiroaki Myoren, Chiko Otani, Tohru Taino
  第７６回応用物理学会秋季学術講演会予稿集, Sep. 2015, [Domestic conference]
• Fabrication and Characterization of Through Si Via for Embedded STJ　　　　　　　　　　　　　　　
  Kohei Morita, Isao Matsumoto, Masato Naruse, Hiroaki Myoren, Masahiro Aoyagi, Tohru Taino
  第７６回応用物理学会秋季学術講演会予稿集, Sep. 2015, [Domestic conference]
• Terahertz imaging using the substrate absorption type STJ with position resolution　　　　　　　　　　　　　　　
  Naoki igarashi, Sone Masahiko, Tohru Taino, Hiroaki Myoren, Masato Naruse, Chiko Otani
  第７６回応用物理学会秋季学術講演会予稿集, Sep. 2015, [Domestic conference]
• Optimization of STJ detector for THz imaging　　　　　　　　　　　　　　　
  Masahiko Sone, Naoki Igarashi, Masato Naruse, Hiroaki Myoren, Chiko Otani, Tohru Taino
  第７６回応用物理学会秋季学術講演会予稿集, Sep. 2015, [Domestic conference]
• Performance evaluation of Kinetic Inductance Detector with Ti/TiN Multilayer Film　　　　　　　　　　　　　　　
  Ryo Koyano, Satoru Mima, Masato Naruse, Hiroaki Myoren, Chiko Otani, Osamu Tajima, Tohru Taino
  第７６回応用物理学会秋季学術講演会予稿集, Sep. 2015, [Domestic conference]
• SFQ Amplified Circuit for Photon-Number-Resolving SNSPD Array　　　　　　　　　　　　　　　
  K.Ota,M.Naruse,T.Taino,J.Chen,P.Wu,H.Myoren
  Extended Abs. ISEC2015, Jul. 2015, [International conference]
• Design and Performance of Digital SQUID with Sub-Flux Quantum Resolution　　　　　　　　　　　　　　　
  H. Myoren, K. Takatoku, M. Naruse, T. Taino
  Extended Abs. ISEC2015, Jul. 2015, [International conference]
• シリコン基板の形状加工による放射線検出器の感度向上　　　　　　　　　　　　　　　
  宮本法明, 成瀬雅人, 田井野 徹, 明連広昭
  第62回応用物理学会春季学術講演会予稿集, Mar. 2015, [Domestic conference]
• ミリ波・サブミリ波オンチップ分光器の開発　　　　　　　　　　　　　　　
  新井慧一, 成瀬雅人, 田井野 徹, 明連広昭, 美馬 覚, 大谷知行
  第62回応用物理学会春季学術講演会予稿集, Mar. 2015, [Domestic conference]
• Performance of Digital SQUID with sub-flux quantum resolution　　　　　　　　　　　　　　　
  K. Takatoku, M. Naruse, T. Taino, H. Myoren
  Proc. SSV2014, Dec. 2014, [Domestic conference]
• Performance of Digital SQUID with sub-flux quantum resolution　　　　　　　　　　　　　　　
  K. Takatoku, M. Naruse, T. Taino, H. Myoren
  Proc. SSV2014, Dec. 2014, [Domestic conference]
• 7 GHz Operation Design for Digital DROS coupled with Relaxa-tion Oscillation Circuit　　　　　　　　　　　　　　　
  R. Kobayashi, M. Naruse, T. Taino, H. Myoren
  Proc. SSV2014, Dec. 2014, [International conference]
• Fabrication Process of STJ Array with Boron Neutron Absorbers for Multi-Quantum Beam Detectors　　　　　　　　　　　　　　　
  N. Hirosaki, M. Naruse, T. Taino, H. Myoren
  Proc. SSV2014, Dec. 2014, [International conference]
• SFQ Readout Circuits for Photon-Number-Resolving SNSPDs　　　　　　　　　　　　　　　
  S. Takeda, M. Naruse, T. Taino, J. Chen, P. Wu, H. Myoren
  Proc. SSV2014, Dec. 2014, [International conference]
• 位置分解能を有する基板吸収型STJ検出器に関する研究　　　　　　　　　　　　　　　
  五十嵐直樹,成瀬雅人,明連広昭,大谷知行,田井野 徹
  第75回応用物理学会学術講演会予稿集, Sep. 2014, [Domestic conference]
• エピタキシャルTiN/AlN/TiN接合の作製と評価　　　　　　　　　　　　　　　
  中山武,成瀬雅人,明連広昭,田井野 徹
  第75回応用物理学会学術講演会予稿集, Sep. 2014, [Domestic conference]
• Si深掘り溝を利用した多量子ビーム検出器の作製　　　　　　　　　　　　　　　
  廣崎直也,成瀬雅人,田井野 徹,明連広昭
  第75回応用物理学会学術講演会予稿集, Sep. 2014, [Domestic conference]
• 超伝導共振器アレイによるガンマ線イメージングカメラの基礎開発　　　　　　　　　　　　　　　
  成瀬雅人,宮本法明,田井野 徹,明連広昭
  第75回応用物理学会学術講演会予稿集, Sep. 2014, [Domestic conference]
• サブ磁束量子分解能をもつデジタルSQUID磁束計の設計　　　　　　　　　　　　　　　
  高徳耕平, 明連広昭, 成瀬雅人, 田井野 徹
  電子情報通信学会2014年ソサイエティ大会講演予稿集, Sep. 2014, [Domestic conference]
• デジタルSQUID用低消費電力8ビットアップダウンカウンタの設計　　　　　　　　　　　　　　　
  張 氷, 明連広昭, 成瀬雅人, 田井野 徹
  電子情報通信学会2014年ソサイエティ大会講演予稿集, Sep. 2014, [Domestic conference]
• SFQ Readout Circuits for Photon-Number-Resolving Superconducting Nanowire Single Photon Detectors　　　　　　　　　　　　　　　
  H. Myoren, S. Takeda, M. Naruse, T. Taino, J. Chen, P. Wu
  Ext. Abs. ASC2014, Aug. 2014, [International conference]
• 外部弛張振動回路によるデジタルDROSセンサの高安定動作　　　　　　　　　　　　　　　
  明連広昭, 小林亮太, 成瀬雅人, 田井野 徹
  2014年度春季低温工学・超電導学会講演予稿集, May 2014, [Domestic conference]
• 単一磁束量子論理によるデジタルSQUIDを用いたSNSPD光子数検出器　　　　　　　　　　　　　　　
  武田俊亮, 成瀬雅人, 田井野 徹, 明連広昭
  電子情報通信学会2013年総合大会講演論文集, Mar. 2014, [Domestic conference]
• 先端センシングシステムに用いられる超伝導検出器　　　　　　　　　　　　　　　
  明連広昭
  電子情報通信学会2013年総合大会講演論文集, Mar. 2014, [Domestic conference]
• 超伝導回路を用いたサブミリ波オンチップ分光計の設計　　　　　　　　　　　　　　　
  成瀬雅人,田之上寛之,新井慧一,関本裕太郎,野口卓,田井野徹,明連広昭
  第61回応用物理学会春季学術講演会, Mar. 2014, [Domestic conference]
• 10B中性子吸収体を付加したSTJ検出器の作製　　　　　　　　　　　　　　　
  佐藤翔治,成瀬雅人,田井野徹,明連広昭
  第61回応用物理学会春季学術講演会講演予稿集, Mar. 2014, [Domestic conference]
• Design of 8-bit Low-energy SFQ Up/Down Counter for Digital DROS　　　　　　　　　　　　　　　
  B. Zhang, M. Naruse, T. Taino, H. Myoren
  Proc. Superconducting SFQ VLSI Workshop SSV2014 for Young Scientists, Mar. 2014, [International conference]
• Design of Digital SQUID with sub-flux quantum resolution　　　　　　　　　　　　　　　
  K. Takatoku, M. Naruse, T. Taino, H. Myoren
  Proc. Superconducting SFQ VLSI Workshop SSV2014 for Young Scientists, Mar. 2014, [International conference]
• SFQ Readout Circuit for Photon-Number-Resolving SNSPDs　　　　　　　　　　　　　　　
  H. Myoren
  Superconducting SFQ VLSI Workshop SSV2013, Nov. 2013, [International conference]
• Design of SFQ Logic Cells with Magnetic Shield Structure for Digital SQUID　　　　　　　　　　　　　　　
  H. Nakagawa, M. Naruse, T. Taino, H. Myoren
  Proc. Superconducting SFQ VLSI Workshop SSV2013, Nov. 2013, [International conference]
• 埋め込み型 STJ フォトン検出器の作製と評価　　　　　　　　　　　　　　　
  石塚達雄, 田井野 徹, 戸塚裕太, 成瀬雅人, 青柳昌宏, 明連広昭
  第74回応用物理学会学術講演会予稿集, Sep. 2013, [Domestic conference]
• 多量子ビーム検出器用 STJ 素子の極低温特性　　　　　　　　　　　　　　　
  佐藤翔治、渡邉 剛、成瀬雅人、田井野 徹、明連広昭
  第74回応用物理学会学術講演会予稿集, Sep. 2013, [Domestic conference]
• エピタキシャル TiN/AlN/TiN 接合の作製　　　　　　　　　　　　　　　
  高崎博行,成瀬雅人,田井野 徹,明連広昭
  第74回応用物理学会学術講演会予稿集, Sep. 2013, [Domestic conference]
• Dark Count Rate of NbN/NiCu Superconducting Nanowire Single Photon Detectors　　　　　　　　　　　　　　　
  H. Myoren, S. Taguchi, M. Naruse, T. Taino, G.P. Pepe, L. Parlato
  Ext. Abs.11th European Conference on Applied Superconductivity (EUCAS2013), Sep. 2013, [International conference]
• デジタルSQUID用磁気シールド構造を持つSFQ論理セルの設計　　　　　　　　　　　　　　　
  中川裕仁, 成瀬雅人, 田井野 徹, 明連広昭
  電子情報通信学会2013年ソサイエティ大会講演予稿集, Sep. 2013, [Domestic conference]
• 光子数検出用SFQ光子数識別回路の設計　　　　　　　　　　　　　　　
  武田俊亮, 成瀬雅人, 田井野 徹, 明連広昭, 陳 健, 呉 培亨
  電子情報通信学会2013年ソサイエティ大会講演予稿集, Sep. 2013, [Domestic conference]
• 多量子ビーム検出器用時分割多重化SFQ信号処理回路の設計　　　　　　　　　　　　　　　
  佐々木 亮, 赤松祐太, 佐藤翔治, 田井野 徹, 明連広昭
  電子情報通信学会2013年ソサイエティ大会講演予稿集, Sep. 2013, [Domestic conference]
• SFQ Digital Signal Processing Circuits for Multi Quantum Beam Detectors using STJ Array with Neutron Absorbers　　　　　　　　　　　　　　　
  H. Myoren, Y. Akamatsu, R. Sato, S. Sato, M. Naruse, T. Taino
  14th Int'l Superconductive Electronics Conference, Jul. 2013, [Domestic conference]
• NbN/NiCu積層薄膜を用いた超伝導ナノワイヤ光子検出器　　　　　　　　　　　　　　　
  明連広昭,田口彰吾,大島一毅,成瀬雅人,田井野徹,G.P. Pepe
  第60回応用物理学会春季学術講演会講演予稿集, Mar. 2013, [Domestic conference]
• STJフォトン検出器用Coupled SQUIDコンパレータ　　　　　　　　　　　　　　　
  村重拓也,成瀬雅人,田井野 徹,明連広昭
  2013年総合大会講演論文集, Mar. 2013, [Domestic conference]
• STJアレイ検出器用時間分割多重化回路の設計　　　　　　　　　　　　　　　
  赤松祐太, 佐々木 亮, 成瀬雅人, 田井野 徹, 明連広昭
  2013年総合大会講演論文集, Mar. 2013, [Domestic conference]
• SFQ Circuits for Multi-Quantum Beam Detectors　　　　　　　　　　　　　　　
  H. Myoren
  Proceedings of Superconducting SFQ VLSI Workshop SSV2012, Dec. 2012, [International conference]
• Performance of Superconducting Single-Photon Detectors using NbN/NiCu nanowires　　　　　　　　　　　　　　　
  H. Myoren, S. Taguchi, K. Ohshima, T. Wakatsuki, T. Taino, L. Parlato and Giovanni P. Pepe
  Ext. Abstract of Applied Superconductivity Conference 2012, Oct. 2012, [International conference]
• STJフォトン検出器の層間絶縁膜イベントの抑制　　　　　　　　　　　　　　　
  石塚達雄,成瀬雅人,田井野徹,明連広昭
  第73回応用物理学会学術講演会講演予稿集, Sep. 2012, [Domestic conference]
• AlNトンネルバリアを用いた超伝導トンネル接合の極低温特性　　　　　　　　　　　　　　　
  西尾拓真,成瀬雅人,田井野徹,明連広昭
  第73回応用物理学会学術講演会講演予稿集, Sep. 2012, [Domestic conference]
• 多量子ビーム検出器用STJ素子の作製　　　　　　　　　　　　　　　
  佐藤翔治,成瀬雅人,田井野徹,明連広昭
  第73回応用物理学会学術講演会講演予稿集, Sep. 2012, [Domestic conference]
• 並列アレイSTJ素子を用いたTHz波検出器に関する研究　　　　　　　　　　　　　　　
  出羽大祐,小野瀬剛弘,成瀬雅人,田井野徹,大谷知行,明連広昭
  第73回応用物理学会学術講演会講演予稿集, Sep. 2012, [Domestic conference]
• 異なる基板上の窒化ニオブを用いた力学インダクタンス検出器の作製　　　　　　　　　　　　　　　
  田之上寛之,有吉誠一郎,田井野徹,古賀健祐,古川 昇,大谷知行,,齊藤 敦,中島健介,成瀬雅人,明連広昭
  第73回応用物理学会学術講演会講演予稿集, Sep. 2012, [Domestic conference]
• 超伝導トンネル接合による多量子ビーム検出器の作製　　　　　　　　　　　　　　　
  佐藤翔治,石井功之,田井野徹,明連広昭
  第59回応用物理学関係連合講演会講演予稿集, Mar. 2012
• 窒化ニオブを用いた力学インダクタンス検出器の作製　　　　　　　　　　　　　　　
  田之上寛之,有吉誠一郎,田井野徹,古賀健祐,古川 昇,齊藤 敦,中島健介,明連広昭,大谷知行
  第59回応用物理学関係連合講演会講演予稿集, Mar. 2012
• 中性子吸収体を付加したSTJ アレイを用いた多量子ビーム検知器用SFQ信号処理回路の設計　　　　　　　　　　　　　　　
  赤松祐太, 佐藤翔治, 田井野 徹, 明連広昭
  2012年総合大会講演論文集, Mar. 2012
• SFQ Digital Signal Processing for Multi Quantum Beam Detector using STJ Array with Neutron Absorber　　　　　　　　　　　　　　　
  Hiroaki Myoren, Yu Fujita, Yuta Akamatsu, and Tohru Taino
  Proceedings of Superconducting SFQ VLSI Workshop SSV2011, Nov. 2011
• Fabrication and Properties of NbN/NiCu Nanowires　　　　　　　　　　　　　　　
  Hiroaki Myoren, Naoto Kashiwazaki, Takuto Wakatsuki, G.P. Pepe, and Tohru Taino
  Abstracts of the 6th East Asia Symposium on Superconductor Electronics EASSE 2011, Oct. 2011
• Design of Digital DROS with SFQ Feedback Circuit for SQUID Array with Wide Dynamic Operation Range　　　　　　　　　　　　　　　
  H. Myoren, K. Terui, N. Shimada and T. Taino
  SCC2011, Sep. 2011
• Transport properties and photo-response experiments on proximitized NiCu/NbN superconducting nanostripes　　　　　　　　　　　　　　　
  G. P. Pepe, N. Marrocco, A. Capretti, L. Parlato, V. Pagliarulo, G.Peluso, A. Barone, R. Cristiano, M. Ejrnaes, A. Casaburi, N. Kashiwazaki, T. Taino, H. Myoren, and Roman Sobolewski
  SCC2011, Sep. 2011
• 広ダイナミックレンジデジタルSQUIDの動作　　　　　　　　　　　　　　　
  明連広昭, 照井晃介, 島田直哉, 田井野 徹
  2011年ソサイエティ大会講演論文集, Sep. 2011
• STJフォトン検出器の基板イベントの抑制　　　　　　　　　　　　　　　
  石井功之,赤羽寛章,田井野徹,明連広昭
  第72回応用物理学会学術講演会講演予稿集, Aug. 2011
• 反射防止膜を用いたTHz波用STJ検出器の特性評価　　　　　　　　　　　　　　　
  鈴木宏宣,田井野徹,有吉誠一郎,大谷知行,明連広昭
  第72回応用物理学会学術講演会講演予稿集, Aug. 2011
• AlNトンネルバリアを用いた超伝導トンネル接合の作製　　　　　　　　　　　　　　　
  西尾拓真,田井野徹,明連広昭
  第72回応用物理学会学術講演会講演予稿集, Aug. 2011
• 分子線エピタキシー法によるエピタキシャル成長薄膜を用いた超伝導トンネル接合の作製　　　　　　　　　　　　　　　
  濱尾俊幸,有吉誠一郎,田井野徹,明連広昭,古賀健祐,大谷知行
  第72回応用物理学会学術講演会講演予稿集, Aug. 2011
• 広ダイナミックレンジデジタルSQUIDの設計　　　　　　　　　　　　　　　
  照井晃介,田井野徹,明連広昭
  第58回応用物理学関係連合講演会講演予稿集, Mar. 2011
• NiCu/NbN二層構造を用いた光検出器　　　　　　　　　　　　　　　
  柏崎直人,田井野徹,Pepe G.P.,明連広昭
  第58回 応用物理学関係連合講演会, Mar. 2011
• 広ダイナミックレンジデジタルSQUIDの高感度化　　　　　　　　　　　　　　　
  明連広昭・照井晃介・島田直哉・田井野 徹
  2011総合大会講演論文集, Mar. 2011
• SFQ 論理によるSTJ アレイ検出器用V/F 型量子化器の設計　　　　　　　　　　　　　　　
  藤田雄, 田井野 徹,明連広昭
  2010ソサイエティ大会講演論文集, Sep. 2010
• DIGITAL DROS WITH SFQ UP/DOWN COUNTER FOR WIDE DYNAMIC OPERATION RANGE　　　　　　　　　　　　　　　
  H. MYOREN, Y. KIMIMOTO, K. TERUI, T. TAINO
  ASC10 Program Book, Aug. 2010
• SUPERCONDUCTOR/FERROMAGNET PROXIMIZED NANOSTRUCTURES FOR OPTICAL PHOTON DETECTION APPLICATIONS　　　　　　　　　　　　　　　
  G. P. PEPE, L. PARLATO, N. MARROCCO, V. PAGLIARULO, G. PELUSO, C. DE LISIO, A. BARONE, R. CRISTIANO, M. EJARNAES, A. CASABURI, H. MYOREN, T. TAINO, R. SOBOLEWSKI, C. BONAVOLONT
  ASC10 Program Book, Aug. 2010
• Ultrafast optical characaterization of NbN proximized structures　　　　　　　　　　　　　　　
  G.P.Pepe, L.Parlato, V.Pagliarulo, N.Marrocco, T.Taino, H.Myoren, A.Casaburi, and R.Cristiano
  Conference Program and Extended Abstracts on 12th International Superconductive Electronics Conference, Jun. 2010
• On-Chip SFQ Flux-Locked Loop Circuits for Digital DROS Sensors", Superconducting SFQ VLSI Workshop　　　　　　　　　　　　　　　
  H.Myoren, S.Iino, T.Taino
  Conference Program and Extended Abstracts of 12th International Superconductive Electronics Conferece, Jun. 2010
• Interconnect Wires for SFQ VLSIs," Superconducting SFQ VLSI Workshop Proceedings　　　　　　　　　　　　　　　
  Y.Suzukawa, T.Taino, H.Myoren
  Workshop on SFQ VLSI, Jun. 2010
• 誘導結合窒素プラズマによる超伝導トンネル接合の作製　　　　　　　　　　　　　　　
  明連広昭、鈴木謙司、田井野徹
  第57 回応用物理学関係連合講演会 講演予稿集, Mar. 2010
• 広いダイナミックレンジを持つデジタルDROSの設計　　　　　　　　　　　　　　　
  明連広昭、王元勇、照井晃介、田井野徹
  2010年電子情報通信学会総合大会予稿集, Mar. 2010
• Interconnect Wires for SFQ VLSIs　　　　　　　　　　　　　　　
  H.Myoren, Y.Suzukawa, M.Miyamoto, T.Taino
  Superconducting SFQ VLSI Workshop Proceedings, Jan. 2010
• Ultrafast optical characterization of NbN proximized nanostructures　　　　　　　　　　　　　　　
  G.P.Pepe, L.Parlato, V.Pagliarulo, N.Marrocco, G.Peluso, A.Barone, T.Taino, H.Myoren, A.Casaburi, R.Cristiano
  9th European Conference on Applied Superconductivity, Sep. 2009
• Optical Interface for SFQ LSI using NbN/NiCu Parallel Nanowire Photo Switches　　　　　　　　　　　　　　　
  H.Myoren, H.Yamamoto, N.Kashiwazaki, Y.Matsui, T.Taino, G.P.Pepe
  Sep. 2009
• テラヘルツ波検出素子としてのAl電極を用いた超伝導トンネル接合の作製　　　　　　　　　　　　　　　
  小川千隼、青木一隆、山下直人、藤岡知宏、田井野徹、明連広昭
  第70回応用物理学会学術講演会講演予稿集, Sep. 2009
• 基板吸収型STJを用いた大面積THz波検出器　　　　　　　　　　　　　　　
  山下直人、青木一隆、渡邉穣、石井宏和、田井野徹、大谷知行、渋沢孝幸、有吉誠一郎、佐藤広海、明連広昭
  第70回応用物理学会学術講演会講演予稿集, Sep. 2009
• SFQ論理による磁束ロックループを用いたデジタルDROS　　　　　　　　　　　　　　　
  飯野智, 田井野徹, 明連広昭
  Mar. 2009
• SFQ光インターフェイス用先頭信号検出回路の高速動作　　　　　　　　　　　　　　　
  明連広昭, 松井雄二, 田井野徹
  Mar. 2009
• Fabrication of STJ integrated on the microstrip-coil for photon detectors　　　　　　　　　　　　　　　
  Matsubara K., Taino T., Kikuchi K., Nakagawa H., Aoyagi M., Sato H., Myoren H.
  Mar. 2009
• Superconducting Photon Detectors for Frontier Photonics　　　　　　　　　　　　　　　
  Myoren H., Taino T.
  Mar. 2009
• 超伝導トンネル接合とその応用　　　　　　　　　　　　　　　
  明連広昭, 田井野徹, 菊地克弥, 仲川博, 青柳昌宏, 佐藤弘, 赤穗博司
  Mar. 2009
• 単一磁束量子論理によるFLL回路を用いたデジタルDROSの構成　　　　　　　　　　　　　　　
  明連広昭
  Dec. 2008
• Deposition Behavior of Polyimide Electodeposition Coating on Various Metal Surfaces　　　　　　　　　　　　　　　
  Ishii M., Yokoshima T., Nakajima S., Segawa S., Wom M. S., Taino T., Myoren H., Nakagawa H., Aoyagi M.
  Oct. 2008
• Low Noise Photon Detector using Superconducting Tunnel Junction　　　　　　　　　　　　　　　
  Taino T., Matsubara K., Nakagawa H., Kikuchi K., Aoyagi M., Sato H., Myoren H.
  Oct. 2008
• 上部・下部グランド層構造を持つSFQ回路の電流分布　　　　　　　　　　　　　　　
  王元勇, 田井野徹, 明連広昭
  Sep. 2008
• 終端信号検出回路を用いたSFQ発生回路の設計　　　　　　　　　　　　　　　
  松井雄二, 田井野徹, 明連広昭
  Sep. 2008
• 超伝導トンネル接合検出器を用いたTHz波分光測定　　　　　　　　　　　　　　　
  山下直人, 青木一隆, 渡邉穣, 石井宏和, 田井野徹, 大谷知行, 渋谷孝幸, 有吉誠一郎, 佐藤広海, 明連広昭
  Sep. 2008
• 基板冷却を用いたAl系超伝導トンネル接合素子の作製　　　　　　　　　　　　　　　
  鷲谷幸司, 田井野徹, 明連広昭
  Sep. 2008
• 基板吸収型並列アレイSTJ検出器によるTHz波の検出　　　　　　　　　　　　　　　
  青木一隆, 山下直人, 渡邉穣, 石井宏和, 田井野徹, 大谷知行, 渋谷孝幸, 有吉誠一郎, 佐藤広海, 明連広昭
  Sep. 2008
• NbN薄膜を用いた平行線構造超伝導フォトン検出器の作製　　　　　　　　　　　　　　　
  山本裕之, 松井雄二, 田井野徹, 明連広昭
  Sep. 2008
• THz Spectroscopy Using Superconducting Tunnel Junction Detectors　　　　　　　　　　　　　　　
  Taino T., Ishii H., Watanabe Y., Aoki K., Yamashita N., Myoren H., Takada S., Ariyoshi S., Otani C., Sato H.
  Aug. 2008
• SFQ Multiplexed Signal Processing Circuits for Superconducting Tunnel Junction Photon Detectors　　　　　　　　　　　　　　　
  Myoren H., Yoshizawa Y., Taino T., Takada S.
  Aug. 2008
• 非開口型走査近接場テラヘルツ顕微鏡の開発　　　　　　　　　　　　　　　
  渡邉穣, 山下将嗣, 田井野徹, 明連広昭, 高田進, 大谷知行
  第55回応用物理学関係連合講演会予稿集, Mar. 2008
• 電着ポリイミド膜を用いた超伝導トンネル接合に関する研究II　　　　　　　　　　　　　　　
  石井真澄, 横島明彦, 田井野徹, 仲川博, 青柳昌宏, 明連広昭, 高田進
  第55回応用物理学関係連合講演会予稿集, Mar. 2008
• rf-SQUIDの状態読み出し用SFQセルの設計　　　　　　　　　　　　　　　
  季立源, 田井野徹, 明連広昭, 高田進
  第55回応用物理学関係連合講演会予稿集, Mar. 2008
• MgO(100)基板上の異なる配向性を持つNb電極を用いた超伝導トンネル接合　　　　　　　　　　　　　　　
  松原毅, 田井野徹, 明連広昭, 高田進
  第55回応用物理学関係連合講演会予稿集, Mar. 2008
• 超伝導トンネル接合素子アレイ用MUXの高速動作　　　　　　　　　　　　　　　
  吉澤有, 田井野徹, 明連広昭, 高田進
  2008年電子情報通信学会総合大会講演論文集, Mar. 2008
• 非開口型走査近接場テラヘルツ顕微鏡の検討　　　　　　　　　　　　　　　
  渡邉穣, 山下将嗣, 田井野徹, 明連広昭, 大谷知行
  2008
• 近接場テラヘルツ顕微鏡の開発　　　　　　　　　　　　　　　
  渡邉穣, 山下雅嗣, 田井野徹, 明連広昭, 大谷知行
  2008
• デジタルDROS用SFQ D/A Converterの設計　　　　　　　　　　　　　　　
  2008
• Prepatation of Sub-micron-wide Microstrip Line for SFQ Circuits　　　　　　　　　　　　　　　
  2008
• デジタルDROS用SFQ D/A Converterの設計　　　　　　　　　　　　　　　
  飯野智, 田井野徹, 明連広昭
  2008
• Prepatation of Sub-micron-wide Microstrip Line for SFQ Circuits　　　　　　　　　　　　　　　
  Myoren H.
  Program and Abs. Superconducting SFQ VLSI Workshop SSV 2008, 2008
• 基盤吸収型テラヘルツ波検出器のイメージングに関する研究　　　　　　　　　　　　　　　
  田井野 徹,明連 広昭,髙田 進,:石井 宏和,青木 一隆,渡邉 穣,山下 直人,大谷 知行,有吉 誠一郎,佐藤 広海
  総合研究機構研究プロジェクト成果発表会 : 口頭発表, Nov. 2007, 埼玉大学総合研究機構
  Nov. 2007 - Nov. 2007
• Large array system by using superconducting tunnel junctions　　　　　　　　　　　　　　　
  Myoren H.
  Program and Abs. The Third CREST Nano-Virtual-Labs Joint Workshop on Superconductivity 2007-Superconducting Sensors-, Oct. 2007, [Domestic conference]
• Superconducting NbN Nanowire Photo Switches for Generating Single Flux Quantum Pulses　　　　　　　　　　　　　　　
  Myoren H., Mada Y., Matsui Y., Taino T., Takada S.
  EXT. Abs. 8th European Conference on Applied Superconductivity, Sep. 2007
• 超伝導トンネル接合素子アレイ用MUXの設計　　　　　　　　　　　　　　　
  吉澤有, 田井野徹, 明連広昭, 高田進
  2007年電子情報通信学会ソサイエティ大会講演論文集, Sep. 2007
• 光インターフェース用SFQ発生回路の設計　　　　　　　　　　　　　　　
  松井雄二, 田井野徹, 明連広昭, 高田進
  2007年電子情報通信学会ソサイエティ大会講演論文集, Sep. 2007
• デジタルDROS用SFQアップダウン回路の設計　　　　　　　　　　　　　　　
  飯野智, 田井野徹, 明連広昭, 高田進
  2007年電子情報通信学会ソサイエティ大会講演論文集, Sep. 2007
• エピタキシャル成長Nb電極を用いた超伝導トンネル接合　　　　　　　　　　　　　　　
  松原毅, 田井野徹, 明連広昭, 高田進
  第68回応用物理学関係連合講演会予稿集, Sep. 2007
• Al系超伝導トンネル接合素子の作製と電気的特性　　　　　　　　　　　　　　　
  鎌田幸佑, 田井野徹, 明連広昭, 高田進
  第68回応用物理学関係連合講演会予稿集, Sep. 2007
• 電着ポリイミド膜を用いた超伝導トンネル接合に関する研究　　　　　　　　　　　　　　　
  石井真澄, 横島時彦, 田井野徹, 仲川博, 青柳昌宏, 明連広昭, 高田進
  第68回応用物理学関係連合講演会予稿集, Sep. 2007
• 超伝導ナノワイヤーを用いた光-SFQ変換スイッチ　　　　　　　　　　　　　　　
  明連広昭, 馬田祐輔, 松井雄二, 田井野徹, 高田進
  第68回応用物理学関係連合講演会予稿集, Sep. 2007
• 基板吸収型並列STJアレイ検出器によるTHz検出器の高感度化　　　　　　　　　　　　　　　
  石井宏和, 田井野徹, 大谷知行, 渋谷孝幸, 有吉誠一郎, 佐藤広海, 明連広昭, 高田進
  第68回応用物理学関係連合講演会予稿集, Sep. 2007
• コイル集積型STJ検出器におけるコイル巻き数と発生磁場の関係　　　　　　　　　　　　　　　
  藤澤祐介, 田井野徹, 明連広昭, 菊地克弥, 仲川博, 青柳昌宏, 佐藤広海, 高田進
  第68回応用物理学関係連合講演会予稿集, Sep. 2007
• Magnetic Shield for SFQ Digital Circuits using Over- and Under Ground Planes Connecting with Wall Structures　　　　　　　　　　　　　　　
  Myoren H., Kishita N., Yoshizawa Y., Taino T., Takada S.
  Ext.Abs. International Superconductive Electronics Conference 2007, Jun. 2007
• STJフォトン検出器アレイからのマイクロ波駆動信号読み出し回路の設計　　　　　　　　　　　　　　　
  内藤拓郎, 田井野徹, 明連広昭, 仲川博, 青柳昌宏, 高田進
  2007年電子情報通信学会総合大会論文集, Mar. 2007
• SFQ論理回路における上部・下部グランド層のシールド効果　　　　　　　　　　　　　　　
  吉澤有, 木下憲昭, 田井野徹, 明連広昭, 高田進
  2007年電子情報通信学会総合大会論文集, Mar. 2007
• 超伝導トンネル接合素子によるX線検出器の動向　　　　　　　　　　　　　　　
  明連広昭, 田井野徹, 高田進
  平成19年度電気学会全国大会論文集, Mar. 2007
• 超伝導トンネル接合フォトン検出器の構造とその特性　　　　　　　　　　　　　　　
  田井野徹, 渡邉穣, 佐藤広海, 明連広昭, 高田進
  2007
• On-chip coil integrated superconducting tunnel junction for photon detector　　　　　　　　　　　　　　　
  Taino T., Fujisawa Y., Narisawa M., Myoren H., Kikuchi K., Nakagawa H., Aoyagi M., Akoh H., Sato H., Shimizu M. H., Maehata K., Ishibashi K., Takada S.
  2th CREST Nano-Vitual-Labs Joint Workshop on Superconductivity, Dec. 2006, [International conference]
• Terahertz Detectors using Superconducting Tunnel Junctions　　　　　　　　　　　　　　　
  Otani C., Ariyoshi S., Taino T., Myoren H., Sato H., Shimizu M. H., Takada S., Kawase K.
  19th International Symposium on Superconductivity, Oct. 2006, [Domestic conference]
• Terahertz Electromagnetic-waves Detector using Nb-based Superconducting Tunnel Junction on LiNbO3 Substrate Absorber　　　　　　　　　　　　　　　
  Taino T., Ishii H., Yoshimura S., Otani C., Ariyoshi S., Myoren H., Kawase K., Shibuya T., Sato H., Shimizu M. H., Takada S.
  19th International Symposium on Superconductivity, Oct. 2006
• 単一磁束量子論理ゲート設計における上部・下部グランド層の効果　　　　　　　　　　　　　　　
  木下憲昭, 田井野徹, 明連広昭, 高田進
  2006年電子情報通信学会ソサイエティ大会講演論文集, Sep. 2006
• Minimization of Parastic Inductances in SFQ Circuits using Over- and Under-Ground Planes　　　　　　　　　　　　　　　
  Myoren H., Kishita N., Taino T., Takada S.
  Applied Superconductivity Conference 2006, Sep. 2006
• ポリイミド絶縁膜を用いた微小ジョセフソン接合の作製　　　　　　　　　　　　　　　
  芹田洋介, 阿佐真一, 田井野徹, 明連広昭, 高田進, 仲川博, 菊地克弥, 青柳昌宏
  第67回応用物理学関係連合講演会予稿集, Sep. 2006
• コイル一体型STJ-X線検出器の作製　　　　　　　　　　　　　　　
  藤澤祐介, 成澤雅人, 田井野徹, 明連広昭, 菊地克弥, 仲川博, 青柳昌宏, 佐藤広海, 延與秀人, 高田進
  第67回応用物理学関係連合講演会予稿集, Sep. 2006
• THz波検出のための基板吸収型STJ検出器の高感度化　　　　　　　　　　　　　　　
  石井宏和, 吉村正太, 田井野徹, 明連広昭, 大谷知行, 渋谷孝幸, 有吉誠一郎, 佐藤広海, 延與秀人, 川瀬晃道, 高田進
  第67回応用物理学関係連合講演会予稿集, Sep. 2006
• 上部・下部グランド層を用いた2分岐型D Flip-Flopゲートの設計　　　　　　　　　　　　　　　
  木下憲昭, 田井野徹, 明連広昭, 高田進
  Mar. 2006
• 周波数多重化方式によるSTJのアレイ化と信号処理　　　　　　　　　　　　　　　
  浜本亘, 田井野徹, 明連広昭, 高田進
  第53回応用物理学関係連合講演会講演予稿集, Mar. 2006
• THz波検出用基板吸収型超伝導トンネル接合素子　　　　　　　　　　　　　　　
  田井野徹, 石井宏和, 吉村正太, 明連広昭, 高田進, 大谷知行, 有吉誠一郎, 佐藤広海, 清水裕彦, 川瀬晃道
  電子情報通信学会電子デバイス研究会, 2006
• Direct and Indirect Detection of THz Waves using a Nb-based Superconducting Tunnel Junction　　　　　　　　　　　　　　　
  Otani C., Nakano R., Taino T., Shibuya T., Ariyoshi S., Myoren H., Sato H., Shimizu M. H., Takada S., Kawase K.
  Abstract of 7th European Conference of Applied Superconductivity, Sep. 2005
• Polyimide Buffer Layer for STJ Photon Detector　　　　　　　　　　　　　　　
  Taino T., Yoshida M., Narisawa M., Myoren H., Kikuchi K., Nakagawa H., Aoyagi M., Sato H., Shimizu M. H., Takada S.
  Abstracts of 7th European Conference of Applied Superconductivity, Sep. 2005
• Quasiparticles Injection Effects for Nb/Al/AlOx/Al/Nb Tunnel Junctions at 0.35 K using Stacked Josephson Junctions　　　　　　　　　　　　　　　
  Myoren H., Shigihara A., Taino T., Takada S.
  Abstracts of 7th European Conference of Applied Superconductivity, Sep. 2005
• 基板吸収型STJ素子のTHz波検出特性　　　　　　　　　　　　　　　
  吉村正太, 中野蘭, 田井野徹, 明連広昭, 高田進, 大谷知行, 渋谷孝幸, 有吉誠一郎, 佐藤広海, 清水裕彦
  第66回応用物理学関係連合講演会講演予稿集, Sep. 2005
• ポリイミドをバッファ層に用いたフォトン検出器の開発　　　　　　　　　　　　　　　
  成澤雅人, 吉田昌代, 田井野徹, 明連広昭, 高田進, 仲川博, 菊地克弥, 青柳昌宏, 佐藤広海, 清水裕彦
  第66回応用物理学関係連合講演会講演予稿集, Sep. 2005
• STJアレー検出器からの周波数多重化による信号読み出し　　　　　　　　　　　　　　　
  浜本亘, 内藤拓朗, 田井野徹, 明連広昭, 高田進
  第66回応用物理学関係連合講演会講演予稿集, Sep. 2005
• Detection of Direct and Indirect Terahertz Waves using a Nb-based Superconducting Tunnel Junction　　　　　　　　　　　　　　　
  Otani C., Nakano R.., Taino T., Shibuya T., Ariyoshi S., Myoren H., Sato H., Shimizu M. H., Takada S., Kawase K.
  Sep. 2005
• Operation Margins for SFQ NAND and NOR Gates Fabricated by a 2.5 kA/cm2 Nb/AlOx/Nb Process　　　　　　　　　　　　　　　
  Myoren H., Kasahara S., Arai T., Taino T., Takada S.
  Extended Abstracts of 10th International Superconductive Electronics Conference, Sep. 2005
• A Broadband THz detector using Superconducting Tunnel Junction　　　　　　　　　　　　　　　
  Taino T., Nakano R.., Yoshimura S., Myoren H., Takada S., Otani C., Ariyoshi S., Shibuya T., Kawase K., Sato H., Shimizu M. H.
  LTD-11 Abstract, Aug. 2005
• 基板検出型STJ検出器のTHz波検出特性　　　　　　　　　　　　　　　
  田井野徹, 中野蘭, 星野耕一, 吉村正太,明連広昭, 大谷知行, 佐藤広海, 川瀬晃道, 清水裕彦, 高田進
  第52回応用物理学学術講演会講演予稿集, Mar. 2005
• ポリイミドをバッファー層に用いたSTJ-X線検出器の開発　　　　　　　　　　　　　　　
  成澤雅人, 吉田昌代, 田井野徹, 明連広昭, 高田進, 仲川博, 菊地克弥, 青柳昌宏, 佐藤広海, 清水裕彦
  第52回応用物理学学術講演会講演予稿集, Mar. 2005
• 全絶縁層にポリイミド膜を用いた超伝導集積回路の作製　　　　　　　　　　　　　　　
  菊地克弥, 仲川博, 青柳昌宏, 赤穂博司, 前畑京介, 石橋健二, 田井野徹, 明連広昭, 高田進
  第52回応用物理学学術講演会講演予稿集, Mar. 2005
• PTL配線を用いたディジタルDROS用SFQカウンタ回路の高速設計　　　　　　　　　　　　　　　
  新井倫明, 明連広昭, 高田進
  第52回応用物理学学術講演会講演予稿集, Mar. 2005
• 桁上げ先見型4JLアップダウンカウンタを用いたデジタルDROSの作製　　　　　　　　　　　　　　　
  後藤勝敏, 明連広昭, 仲川博, 所和彦, 青柳昌宏, 高田進
  第52回応用物理学学術講演会講演予稿集, Mar. 2005
• SFQ論理を用いたユニバーサルゲートの高速動作　　　　　　　　　　　　　　　
  笠原信一, 新井倫明, 明連広昭, 田井野徹, 高田進
  第52回応用物理学学術講演会講演予稿集, Mar. 2005
• 基板吸収型STJ素子を用いたTHz波検出器　　　　　　　　　　　　　　　
  明連広昭, 中野蘭, 星野耕一, 吉村正太, 田井野徹, 大谷知行, 渋谷孝幸, 佐藤広海, 清水裕彦, 高田進, 川瀬晃道
  2005年電子情報通信学会総合大会, Mar. 2005
• Design and Fabrication of Digital DROS with Superconducting Flux-Locked Loop　　　　　　　　　　　　　　　
  Myoren H., Goto M., Taino T., Kikuchi K., Nakagawa H., Tokoro K., Aoyagi M., Takada S.
  Proceedings of 2005 Japan-Taiwan Symposium on Superconductive Electronics, Feb. 2005
• Al系超伝導トンネル接合素子を用いたフォトン検出器の作製　　　　　　　　　　　　　　　
  阿佐真一, 鎌田幸佑, 田井野徹, 明連広昭, 高田進, 仲川博, 菊地克弥, 青柳昌宏, 赤穂博司
  第66回応用物理学関係連合講演会講演予稿集, 2005
• Taトラップ層を用いたSTJ素子のX線検出特性　　　　　　　　　　　　　　　
  吉村正太, 中野蘭, 田井野徹, 明連広昭, 佐藤広海, 清水裕彦, 高田進
  第52回応用物理学学術講演会講演予稿集, 2005
• Al系超伝導トンネル接合素子を用いたフォトン検出器の作製　　　　　　　　　　　　　　　
  第66回応用物理学関係連合講演会講演予稿集, 2005
• Taトラップ層を用いたSTJ素子のX線検出特性　　　　　　　　　　　　　　　
  第52回応用物理学学術講演会講演予稿集, 2005
• Development of Terahertz Wave Detector using Superconducting Tunnel Junction　　　　　　　　　　　　　　　
  Taino T., Hoshino K., Nakano R., Otani C., Myoren H., Kawase K., Shibuya T., Sato H., Shimizu M. H., Takada S.
  17th International Symposium on Superconductivity, Nov. 2004
• High Reliable Fabrication Process for Superconducting Integrated Circuits with Simply Fabrication Technology of All Various Via-holes Using Photosensitive Polymide Insulation Layers　　　　　　　　　　　　　　　
  Kikuchi K., Nakagawa H., Tokoro K., Aoyagi M., Goto M., Taino T., Myoren H., Takada S.
  2004 Applied Superconductivity Conference, Oct. 2004
• Double Relaxation Oscillation SQUID with a 4JL on-chip digital flux locked-loop circuit　　　　　　　　　　　　　　　
  Myoren H., Goto M., Taino T., Takada S., Kikuchi K., Nakagawa H., Tokoro K., Aoyagi M.
  2004 Applied Superconductivity Conference, Oct. 2004
• Difference of X-ray-induced substrate phonon events observed with superconducting tunnel junctions on a sapphire and a LiNbO3 substrate　　　　　　　　　　　　　　　
  Taino T., Hoshino K., Nakano R., Otani C., Myoren H., Kawase K., Sato H., Shimizu M. H., Takada S.
  2004 Applied Superconductivity Conference, Oct. 2004
• A broad-band Thz radiation detector using a Nb-based superconducting tunnel junction　　　　　　　　　　　　　　　
  Otani C., Kawase K., Shibuya T., Sato H., Shimizu M. H., Hoshino K., Taino T., Myoren H., Takada S., Ariyoshi S.
  2004 Applied Superconductivity Conference, Oct. 2004
• X-ray detection using superconducting tunnel junctions with polyimide insulation layer　　　　　　　　　　　　　　　
  Yoshida M., Hoshino K., Taino T., Myoren H., Takada S., Kikuchi K., Nakagawa H., Aoyagi M., Sato H., Shimizu M. H.
  2004 Applied Superconductivity Conference, Oct. 2004
• Terahertz Detector Using a Nb-based Superconducting Tunnel Junction　　　　　　　　　　　　　　　
  Otani C., Hoshino K., Taino T., Myoren H., Nakano R., Ariyoshi S., Sato H., Shimizu M. H., Takada S., Kawase K.
  29th International Conference on Infrared and Millimeter Waves and 12th International Conference on Terahertz Electronics, Sep. 2004
• 感光性ポリイミドを用いたSTJ-X線検出器の開発　　　　　　　　　　　　　　　
  吉田昌代, 田井野徹, 明連広昭, 高田進
  第65回応用物理学関係連合講演会講演予稿集, Sep. 2004
• SQUIDアレイ増幅器の共振特性　　　　　　　　　　　　　　　
  師岡利光, 石川達次, 明連広昭, 高田進, 茅根一夫
  第65回応用物理学関係連合講演会講演予稿集, Sep. 2004
• 超伝導トンネル接合素子を用いた基板吸収型テラヘルツ波検出器の開発 (II)　　　　　　　　　　　　　　　
  大谷知行, 田井野徹, 中野蘭, 明連広昭, 有吉誠一郎, 佐藤広海, 清水裕彦, 川瀬晃道
  第65回応用物理学関係連合講演会講演予稿集, Sep. 2004
• ポリイミド絶縁層を用いたオンチップフォトン検出素子の作製　　　　　　　　　　　　　　　
  菊地克弥, 仲川博, 青柳昌宏, 赤穂博司, 前畑京介, 石橋健二, 田井野徹, 明連広昭, 高田進
  第51回応用物理学学術講演会講演予稿集, Mar. 2004
• 基板吸収型STJを用いたTHz波検出器　　　　　　　　　　　　　　　
  星野耕一, 田井野徹, 明連広昭, 大谷知行, 佐藤広海, 川瀬晃道, 清水裕彦, 高田進
  第51回応用物理学学術講演会講演予稿集, Mar. 2004
• デジタルDROS用パラレル入力4JLアップダウンカウンタの設計　　　　　　　　　　　　　　　
  後藤勝敏, 明連広昭, 菊地克弥, 仲川博, 所和彦, 青柳昌宏, 高田進
  第51回応用物理学学術講演会講演予稿集, Mar. 2004
• SFQ論理を用いたユニバーサルゲートの設計　　　　　　　　　　　　　　　
  笠原信一, 明連広昭, 高田進
  第65回応用物理学関係連合講演会講演予稿集, 2004
• LiNbO3, Al2O3基板を用いたSTJ検出器の動作特性　　　　　　　　　　　　　　　
  2004
• SFQ論理を用いたユニバーサルゲートの設計　　　　　　　　　　　　　　　
  第65回応用物理学関係連合講演会講演予稿集, 2004
• LiNbO3, Al2O3基板を用いたSTJ検出器の動作特性　　　　　　　　　　　　　　　
  中野蘭, 星野耕一, 田井野徹, 明連広昭, 大谷知行, 佐藤広海, 川瀬晃道, 清水裕彦, 高田進
  第65回応用物理学関係連合講演会講演予稿集, 2004

• Braiding Operation using SFQ Current Pulses for Topological Quantum Computer　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Research (Exploratory), Jul. 2021 - Mar. 2024
  Saitama University
  Grant amount(Total)：6500000, Direct funding：5000000, Indirect funding：1500000
  Grant number：21K18708
• Sub-micron superconducting PTLs for SFQ logic circuits　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Priority Areas, 2006 - 2009
  MYOREN Hiroaki; TAINO Tohru, Saitama University
  Grant amount(Total)：51500000, Direct funding：51500000
  We have designed and fabricated sub-micron-wide microstrip lines (MSLs) for SFQ circuits. We adopted Al_2O_3 as the insulator of MSLs to realize characteristic impedance of 10 Ω which is equivalent to one of future SFQ VLSI circuits. To evaluate propagation characteristics of MSLs, we measured loaded quality factors of resonance QL. In this measurement, we obtained fundamental resonance peaks around 6 GHz against a design value 5 GHz for each MSL and respective QL is about 100.
  For the high-density SFQ VLSI circuits, three-dimensional (3-D) integration will be needed. We are trying an Nb electrodeposition from non-aqueous electrolytes, which is suitable for making 3-D wiring through substrates. For the Nb electrodeposition from non-aqueous electrolytes, relatively smooth, metallic colored Nb compound films were obtained from solutions containing LiNbCl_6.
  Grant number：18080002
• Optical Interface for Superconducting Digital Circuits using Low temperature Photon Detectors　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 2005 - 2007
  MYOREN Hiroaki; TAKADA Susumu; TAINO Tohru, Saitama University
  Grant amount(Total)：16240000, Direct funding：15400000, Indirect funding：840000
  We investigated superconducting NbN nanowire as a photo switch for generating single flux quantum (SFQ) pulses.
  Epitaxially grown NbN thin films were prepared on MgO (100) substrates by a dc magnetron sputtering method using gas mixture of Ar + N_2, without substrate heating. NbN thin films showed Tc of 14K for 8 nm, and 10K for 4 nm.
  NbN nanowires were patterned using a electron direct drawing method with 200 nm thick electron resist. To increasing photo-sensitive regions, we fabricated 50 x 50 μm^2 meander patterns with NbN nanowires. Line width of nanowires was varied from 200 nm to 500 nm. Critical current density of NbN nanowires was about 3x10^6A/cm^2 at 4.2 K.
  We irradiated 850-nm laser pulses via 50-mm multi-mode optical fibers. Repetition frequency and pulse width could be controlled by a pulse pattern generator. The maximum laser pulse power was about 1 mW. Using 200-nm-wide NbN nanowires, one third of critical current was suppressed by 1 mW CW laser irradiations. High speed responses were observed for laser pulses with repetition frequency of 1MHz and pulse width of 2 ns.
  On the other hand, we designed an SFQ generation circuit using Josephson transmission lines assuming NbN nanowire switch generates 60 μA current pulses. The designed circuit could generate SFQ pulses by 10 μA, 25 GHz current pulses. Dc bias margin of the circuit was +- 15% for 60 μA current pulses.
  Grant number：17360154
• Double Relaxation Oscillation SQUID Magnetometer with Superconducting Digital Flux-Locked Loop　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 2002 - 2004
  MYOREN Hiroaki; TAKADA Susumu, Saitama University
  Grant amount(Total)：8800000, Direct funding：8800000
  On-chip double relaxation oscillation SQUID(DROS) with a superconducting digital flux locked-loop(FLL) circuit is demonstrated far high sensitive magnetic flux sensor and SQUID amplifier. In this study, we examined two kinds of superconducting digital FLL circuits : one was composed of a 8-bit up/down counter and a 8-bit R-2R ladder-type D/A converter designed using 4JL-gates which are driven by a two phase power supply at a frequency up to 4GHz. The other one was composed of an on-chip FLL circuit based on a Josephson counter and a 6-bit up/down counter using SFQ logic gates.
  In the up/down counter, we used binary carry lookahead(BCL) circuits for high-speed operation. Logic simulations for the 4JL 8-bit up/down counter with BCL circuits showed correct up-and down-counting operation at 4GHz clock frequency assuming a 2.5kA/cm^2 Nb/Al-AlO_x/Nb junction technology. We expected that a DROS with the superconducting digital FLL circuit has large slew rate as high as 10-7Φ_0/s.
  Using the 6-bit up/down counter using SFQ logic gates, logic simulations showed the correct up and down counting operation up to 33GHz and we expected that a DROS with the SFQ digital FLL circuits can be operated at 10GHz.
  Grant number：14350177
• Fabrication of NbTiN Tunnel Junctions for Superconducting Logic Circuits　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), 1999 - 2001
  MYOREN Hiroaki; TAKADA Susumu, Saitama University
  Grant amount(Total)：3500000, Direct funding：3500000
  We prepared Nb_<1-x>Ti_xN (NbTiN) thin films by reactive do magnetron sputtering without intentional heating. Superconducting properties were strongly related to sputtering conditions. Lattice parameters of NbTiN films approached that of bulk NbTiN with decreasing the N_2 mole fraction in Ar and N_2 sputtering gas mixture. The film orientation was also strongly related with the sputtering conditions such as gas pressure. NbN thin films could grow epitaxially on MgO(100) substrates and showed very smooth surfaces. We found that smooth NbTiN films could be obtained on MgO(100) substrates with epitaxially grown NbN template layer. Superconducting critical temperature of NbTiN films were up to 14.5 K.
  We prepared AlN thin films for tunnel barriers and found that smooth AlN thin layers could be obtained by reactive dc magnetron sputtering with relatively small sputtering power of 50 W. Etching rate of AlN layers was decreased with increasing CF_4 gas pressure and AlN layer could behave as a etching stopping layer. We fabricated NbTiN/AlN/NbTiN tunnel structure and observed I-V curves with the superoonducting energy-gap structure.
  We successfully designed and fabricated single flux quantum (SFQ) NAND and NOR gates. We designed mask layouts of the gates assuming a 2.5 kA/cm^2 Nb/AlO_x/Nb junction process and optimized device parameters using an SFQ circuit-optimizing tool. Fabricated NAND and NOR gates had a critical margin more than ±20% for low-frequency operation. Bias margin for a fabricated NAND gate exceed ±25%.
  Grant number：11650313
• HIGH T_C SUPERCONDUCTING ELECTROMAGNETIC WAVE DETECTORS FOR MILLIMETER AND SUBMILLIMETER BANDS USING SILICON SUBSTRATES　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), 1995 - 1997
  NAKAJIMA Kensuke; MYOREN Hiroaki; CHEN Jian; YAMASHITA Tsutomu, TOHOKU UNIVERSITY
  Grant amount(Total)：6000000, Direct funding：6000000
  It is expected that high Tc superconducting millimeter and submillimeter wave devices such as a low loss transmission line and a high sensitivity detector, which can be operated with a simple cryogenic system, are applicable for a ultra high speed communication system in order to supply a communication demand. Specific high frequency properties of high T_C superconductors caused by the characteristic layred structure is also attractive from the application point of view. In this research project we aimed to develop fundamental technologies of electromagnetic wave detectors for millimeter and submillimeter bands using high T_C superconducting YBCO grain boundary Josephson junctions (GBJJ) on silicon bicrystal substrates. We have first succeeded a video detection of 2.525THz signal using YBCO GBJJs operated at 70K as a result of improvements of junction parameters such as the supercondcuting transition temperature, Tc and the I_CR_N product. Furthermore, we found that high frequency response (Shapiro step) was enhanced by a weak magnetic field application for wide frequency range up to submillimeter wave through microwave. This is a quite useful knowledge to develop a practical submillimater wave spectrometer using the GBJJ.Harmonic heterodyne mixing experiments were also performed using GBJJ for a submillimeter signal of f_S=2.525THz and a microwave signal of f_=19.4176268GHz then we had 130th harmonic mixing output {IF (Intermediate Frequency) output}. For the harmonic mixing we had the signal and noise ratio (S/N) of about 20dB and the spectrum resolution of 100KHz. The S/N would be improved to some extent by optimizing high frequency circuit design. In conclusion we have substantiated that the harmonic heterodyne mixing using GBJJs performs the high spectrum resolution for millimater and submillimeter waves and a precise spectrometer for the entire frequency range will be practical together with the video detection.
  Grant number：07555410
• Research on High Tc superconducting three terminal devices utilizing the function of grain boundary　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for General Scientific Research (C), 1994 - 1995
  NAKAJIMA Kensuke; CHEN Jian; MYOREN Hiroaki, Tohoku University
  Grant amount(Total)：2300000, Direct funding：2300000
  Field effects of High-T_c Oxide Superconductors expected from their characterisctics of low carrier densities and short coherent lengths are hopefully applicable to superconducting three terminal devices. To achieve actual devices, however, a lot of difficulties, i. e fabrication of high quality ultra thin ETSC films with the thickness of several nm and development of insulating layr with a large dielectric constant still remains. From the another point of view, tilt grain boundaries not only behave as Josephson junctions but also have a large field sensitiviy because of local deficiency of charge carriers due to oxygen deficiency in the boundaries.
  In this research, we have investigated the electric field effects on artificial grain boundaries of YBCO films and obtained following results.
  ・The carrier density of the grain boundary was evaluated to be 2-5*10^<20>cm^<-3> from the measurement of the electric field effect on a normal conducting artificial grain boundary adjoining two superconducting YBCO grains. The carrier density was one drder lower than that in inner grains so that large electric field effects were expected. This is the first result indicating the usefulness of grain boudaries as field effect channels.
  ・As electric field effects with respect to AC and DC Josephson effects on the grain boundaries behaving as Josephson junctions, electric field modulations of both critical current, I_c and self resonance frequency were observed. For former effect, it was shown that the field effect in I_c was qualititavely explained by a charge carrier modulation in grain boundary junctions on the basis of the SNS model. For later one, the variations of the resonance frequencies were attributed to changes in the effective dielectric constants, epsilon^GB_/d reflecting the field strength dependence ofthe dielectric constant of STO used as substrates. The electric field modulation of epsilon^GB_/d is possibly applicable to the phase velocity control of electromagnetic waves transmitting in the grain boundaries in the case of Flux Flow Oscilator (FFO).
  Grant number：06650349
• 高温超伝導人口粒界接合の集積化に関する研究　　　　　　　　　　　　　　　
  1993 - 1993
  Grant amount(Total)：900000, Direct funding：900000
  Grant number：05750275
• 高温超伝導体/酸化物積層膜の作製　　　　　　　　　　　　　　　
  1992 - 1992
  Grant amount(Total)：900000, Direct funding：900000
  Grant number：04750254
• Si上のZro_2膜へのasーgrown高温超伝導膜の形成と超伝導素子への応用　　　　　　　　　　　　　　　
  1991 - 1991
  Grant amount(Total)：2000000, Direct funding：2000000
  Grant number：03210224
• Si上のZrO_2膜へのasーgrown高温超伝導膜の形成と超伝導素子への応用　　　　　　　　　　　　　　　
  1990 - 1990
  Grant amount(Total)：2700000, Direct funding：2700000
  Grant number：02226223