Takashi Tachiki

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Name
Takashi Tachiki

Research Areas

 
 

Academic & Professional Experience

 
Apr 2017
   
 
Professor, Department of Electrical and Electronic Engineering, National Defense Academy
 
Apr 2007
 - 
Mar 2017
Associate Professor, Department of Electrical and Electronic Engineering, National Defense Academy
 
Apr 2003
 - 
Mar 2007
Lecturer, Department of Electrical and Electronic Engineering, National Defense Academy
 
Apr 2000
 - 
Mar 2003
Research associate, Department of Electrical and Electronic Engineering, National Defense Academy
 

Education

 
Apr 1995
 - 
Mar 2000
Department of Electrical Communications Engineering, Graduate School of Engineering, Tohoku University
 
Apr 1991
 - 
Mar 1995
Department of Electrical and Information Engineering, Faculty of Engineering, Yamagata University
 

Awards & Honors

 
May 2015
Evaluation of radiation properties in terahertz-wave oscillators using Bi-2212 intrinsic Josephson junctions, JSIR Paper Award, The Japan Society of Infrared Science and Technology
 

Published Papers

 
Uchida Takashi, Matsushita Akihito, Tachiki Takashi
IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING   13(6) 876-881   Jun 2018   [Refereed]
Uchida Takashi, Kasai Hiroyuki, Tachiki Takashi
IEEJ Transactions on Fundamentals and Materials   135(8) 481-487   2015
VOx precursor thin films were fabricated by metal-organic decomposition (MOD). Then, the films were fired with a temperature of 500-720°C, time of 5-20 min and pressure of 1.2-10 Pa in O2 and the air (O2: 21%). The...
Evaluation of Cavity Modes in Superconducting Intrinsic-Josephson-Junction Oscillators for Terahertz-wave Generation
T. Tachiki, H. Katada, T. Uchida
Journal of Infrared, Millimeter, and Terahertz Waves   35(6-7) 509-516   Jun 2014   [Refereed]
TACHIKI Takashi, KATADA Hiroshi, UCHIDA Takashi
TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)   49(7) 367-372   2014   [Refereed]
To calculate the radiation properties of terahertz-wave oscillators using intrinsic Josephson junctions, an analytical solution of the coupled sine-Gordon equation was obtained by applying continuous approximation and a radiation boundary conditio...
立木 隆, 堅田 寛, 内田 貴司
Journal of the Japan Society of Infrared Science and Technolog   23(2) 66-72   Dec 2013   [Refereed]
Le Ngoc Son,Takashi Tachiki,Takashi Uchida,Yoshizumi Yasuoka
IEICE Transactions   95-C(5) 936-941   May 2012   [Refereed]
TACHIKI Takashi, UCHIDA Takashi
IEEJ Transactions on Fundamentals and Materials   132(9) 747-752   Sep 2012   [Refereed]
To evaluate cavity resonance modes in terahertz-wave oscillators using intrinsic Josephson junction stacks in high-temperature superconductors, an analytical solution of the coupled sine-Gordon equation was obtained by a continuous approximation. ...
Teppei Uchida, Wataru Kimura, Kensuke Nakajima, Takashi Tachiki, Takashi Uchida
IEEE Transactions on Applied Superconductivity   28(4) 1   Jun 2018   [Refereed]
Van Nhu Hai, Kawahara Masami, Samura Tsuyoshi, Tachiki Takashi, Uchida Takashi
JAPANESE JOURNAL OF APPLIED PHYSICS   58(7)    Jul 2019   [Refereed]
Maeda Kohei, Van Nhu Hai, Nishioka Kunio, Matsutani Akihiro, Tachiki Takashi, Uchida Takashi
ELECTRONICS AND COMMUNICATIONS IN JAPAN   102(3) 12-20   Mar 2019   [Refereed]
Le Ngoc Son, Tachiki Takashi, Uchida Takashi
JAPANESE JOURNAL OF APPLIED PHYSICS   52(4)    Apr 2013   [Refereed]
Uchida Takashi, Matsushita Akihito, Tachiki Takashi
JAPANESE JOURNAL OF APPLIED PHYSICS   53(6)    Jun 2014   [Refereed]
Son Le Ngoc, Tachiki Takashi, Uchida Takashi
JAPANESE JOURNAL OF APPLIED PHYSICS   51(8)    Aug 2012   [Refereed]
Son Le Ngoc, Tachiki Takashi, Uchida Takashi
JAPANESE JOURNAL OF APPLIED PHYSICS   50(2)    Feb 2011   [Refereed]
Influence of thermal noise on terahertz-wave radiation from intrinsic Josephson junctions
T. Tachiki, T. Uchida
Physica C   471 1206-1209   Nov 2011   [Refereed]
Tachiki Takashi, Uchida Takashi
JOURNAL OF APPLIED PHYSICS   107(10)    May 2010   [Refereed]
Intrinsic Josephson Junctions in Bi-2212 Thin Films Fabricated by Metal-Organic Decomposition
K. Hamanaka, K. Oho, T. Tachiki, T. Uchida
IEEE Transactions on Applied Superconductivity   21(3) 168-171   Jun 2011   [Refereed]
Hayashi Kosuke, Furuya Takashi, Tachiki Takashi, Uchida Takashi, Idehara Toshitaka, Yasuoka Yoshizumi
JAPANESE JOURNAL OF APPLIED PHYSICS   49(3)    2010   [Refereed]
Hamanaka Koji, Tachiki Takashi, Uchida Takashi
JAPANESE JOURNAL OF APPLIED PHYSICS   48(12)    Dec 2009   [Refereed]
UCHIDA Takashi, HAMANAKA Koji, TACHIKI Takashi
Journal of the Japan Society of Infraed Science and Technolog   20(1) 53-58   Dec 2010   [Refereed]
Hayashi Kosuke, Tachiki Takashi, Uchida Takashi, Furuya Takashi, Idehara Toshitaka, Yasuoka Yoshizumi
JAPANESE JOURNAL OF APPLIED PHYSICS   48(8)    Aug 2009   [Refereed]
Investigation of characteristics for different film thickness of Bi-2212/MgO fabricated by metal-organic decomposition
K. Hamanaka, T. Tachiki, T. Uchida
Physica C   470 1457-1460   Nov 2010   [Refereed]
Uchiyama Tetsuji, Watanabe Shoji, Tachiki Takashi, Uchida Takashi
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   46(12) 7849-7851   Dec 2007   [Refereed]
Tachiki Takashi, Uchida Takashi
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   17(2) 237-240   Jun 2007   [Refereed]
Investigation of in-plane-orientation characteristics for Bi-2212/MgO thin films fabricated by the MOD
S. Watanabe, K. Hamanaka, T. Tachiki, T. Uchida
Physica C   469 818-821   Jul 2009   [Refereed]
Investigation of I-V characteristics of Bi-2212 intrinsic Josephson junctions for THz-wave generation
T. Tachiki, A. Sugawara, T. Uchida
Physica C   469(15-20) 1604-1607   Jul 2009   [Refereed]
TACHIKI Takashi, UCHIDA Takashi
Journal of the Japan Society of Infraed Science and Technolog   17(2) 35-39   Sep 2008   [Refereed]
Emission of Coherent THz Radiation from Superconductors
L. Ozyuzer, A. E. Koshelev, C. Kurter, N. Gopalsami, Q. Li, M. Tachiki, K. Kadowaki, T. Yamamoto, H. Minami, H. Yamaguchi, T. Tachiki, K. E. Gray, W. -K. Kwok, U. Welp
SCIENCE   318 1291-1293   Nov 2007   [Refereed]
TACHIKI Takashi, UCHIDA Takashi
Journal of the Cryogenic Society of Japan   41(6) 258-263   Jun 2006   [Refereed]
Microwave-induced steps observed in Bi-2212 intrinsic Josephson junctions
T. Tachiki, S. Someya, T. Uchida, Y. Yasuoka
IEEE Transactions on Applied Superconductivity   15 185-188   Jun 2005   [Refereed]
Transport Characteristics in c-Axis La_{2-x}Sr_xCuO_4(LSCO) Single Crystals
S. Kim, T. Hatano, G. Kim, T. Tachiki, I. Tanaka, Y. Takano, M. Tachiki, T. Yamashita
IEEE Transactions on Applied Superconductivity   15 3782-3785   Jun 2005   [Refereed]
UCHIDA Takashi, NISHIDA Takayuki, TACHIKI Takashi, YASUOKA Yoshizumi
TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)   39(6) 271-276   Jun 2004   [Refereed]
The study of nonbolometric responses caused by the vortex motion and other factors of YBa2Cu3O7-δ (YBCO) microbridges has received much attention because of possible applications for sensitive and fast respon...
BSCCO intrinsic Josephson junctions for microwave detection
T. Tachiki, T. Uchida, Y. Yasuoka
IEEE Transactions on Applied Superconductivity   13 901-903   Jun 2003   [Refereed]
Detection properties of slot antenna coupled YBCO micro-bridges based on the vortex motion
T. Nishida, T. Uchida, T. Tachiki, Y. Yasuoka
IEEE Transactions on Applied Superconductivity   13 1017-1019   Jun 2003   [Refereed]
UCHIDA Takashi, NISHIDA Takayuki, TACHIKI Takashi, YASUOKA Yoshizumi
TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)   38(1) 22-26   2003   [Refereed]
Slot antenna-coupled high-Tc YBa2Cu3O7-δ(YBCO) microbridges were fabricated and their millimeter-wave detection properties in the resistive state were investigated at 94 GHz. The nonbolometric resp...
Josephson vortex flow in La_{2-x}Sr_xCuO_4 single crystals
T. Tachiki, K. Nakajima, T. Yamashita, I. Tanaka
Physica C   362 277-281   Apr 2001   [Refereed]
The origin of resistance peak effect in high-temperature superconductors- apparent ?_c anisotropy due to T_c anisotropy
C. Buzea, T. Tachiki, K. Nakajima, T. Yamashita
IEEE Transactions on Applied Superconductivity   11 3655-3658   Mar 2001   [Refereed]
Investigation of microwave responses in BSCCO-2212 intrinsic Josephson junctions up to short millimeter wavebands
H. B. Wang, J. Chen, Y. Aruga, T. Tachiki, Y. Mizugaki, K. Nakajima, T. Yamashita, P. H. Wu
Physica C   341-348 2737-2738   Nov 2000   [Refereed]
Microwave-induced current steps in intrinsic Josephson junctions patterned on Bi_2Sr_2CaCu_2O_8 single crystal
H. B. Wang, Y. Aruga, T. Tachiki, Y. Mizugaki, J. Chen, K. Nakajima, T. Yamashita, P. H. Wu
APPLIED PHYSICS LETTERS   74 3693-3695   Mar 2000   [Refereed]
Flux-flow resonant current steps in intrinsic Josephson junctions on Bi_2Sr_2CaCu_2O_8 single crystal
H. B. Wang, T. Tachiki, Y. Aruga, Y. Mizugaki, J. Chen, K. Nakajima, T. Yamashita, P. H. Wu
SUPERCONDUCTOR SCIENCE AND TECHNOLOGY   12 1004-1006   Nov 1999   [Refereed]
Harmonic frequency mixing in Bi_2Sr_2CaCu_2O_{8+x} intrinsic Josephson junctions
H. B. Wang, Y. Aruga, T. Tachiki, Y. Mizugaki, J. Chen, K. Nakajima, T. Yamashita, P. H. Wu
APPLIED PHYSICS LETTERS   75 2310-2312   Oct 1999   [Refereed]
Flux flow of La-Sr-Cu-O single crystals
T. Tachiki, K. Nakajima, T. Yamashita, I. Tanaka, H. Kojima
IEEE Transactions on Applied Superconductivity   9 2191-2194   Jun 1999   [Refereed]
Intrinsic Josephson junctions in oxygen-deficient YBa_2Cu_3O_{7-δ} film deposited on substrate step
H. B. Wang, J. Chen, T. Tachiki, Y. Mizugaki, K. Nakajima, T. Yamashita
JOURNAL OF APPLIED PHYSICS   85 3740-3744   Apr 1999   [Refereed]
Anisotropic resistivity of in-plane-aligned La???Sr_xCuO_4(100) films on LaSrGaO_4(100) substrates
H. Myoren, R. Bergs, T. Tachiki, J. Chen, K. Nakajima, M. Suzuki, T. Yamashita, H. Sato, M. Naito
JAPANESE JOURNAL OF APPLIED PHYSICS   36 2642-2645   May 1997   [Refereed]

Misc

 
江口 哲平, 立木 隆, 内田 貴司
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   119(164) 31-35   Aug 2019
立木 隆, 内田 貴司
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   117(10) 41-46   Apr 2017
立木 隆, 内田 貴司
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   115(13) 29-34   Apr 2015
Investigation of Bias-Voltage Dependence of Radiation Power in Bi-2212 Intrinsic Josephson Junction THz-Wave Oscillators
2015 15TH INTERNATIONAL SUPERCONDUCTIVE ELECTRONICS CONFERENCE (ISEC)      2015   [Refereed]
TACHIKI Takashi, KATADA Hiroshi, UCHIDA Takashi
Technical report of IEICE. SCE   113(401) 79-84   Jan 2014
A terahertz-wave oscillator using Bi_2Sr_2CaCu_2O_<8+δ> intrinsic Josephson junctions whose shape was a rectangular mesa with 78 μm × 138 μm × 1.0 μm acting as a electromagnetic cavity was fabricated, and the temperature dependencies of an I-V cha...
TACHIKI T., KATADA H., UCHIDA T.
レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan   440 7-12   Feb 2013
KATADA Hiroshi, TACHIKI Takashi, UCHIDA Takashi
Technical report of IEICE. SCE   112(262) 1-6   Oct 2012
In order to realize antenna-coupled terahertz (THz)-wave oscillators using intrinsic Josephson junctions (IJJs) for high power generation, cavity-resonant modes were evaluated from radiation frequencies of a oscillator part consisting of IJJs. A r...
TACHIKI Takashi, UCHIDA Takashi
Technical report of IEICE. SCE   110(235) 7-12   Oct 2010
In order to investigate the influence of thermal fluctuations on spectra of terahertz waves radiated from Bi_2Sr_2CaCu_2O_<8+x> intrinsic Josephson Junctions under a bias current flow, we performed a numerical simulation using the coupled sine-Gor...
HAMANAKA Koji, TACHIKI Takashi, UCHIDA Takashi
IEICE technical report   109(141) 1-6   Jul 2009
We have fabricated a Bi_2Sr_2CaCu_2O_<8+x>(Bi-2212) thin film on a MgO substrate by the metal-organic decomposition (MOD) method to apply the film to high frequency devices such as a terahertz oscillator and detector. However, in order to apply th...
TACHIKI Takashi, UCHIDA Takashi
IEICE technical report   109(141) 7-12   Jul 2009
In order to investigate Terahertz radiation from Bi_2Sr_2CaCu_2O_<8+x> intrinsic Josephson Junctions under a bias current flow, we have performed a numerical simulation of radiation properties of junction stacks with two different sizes; a number ...
HAMANAKA Koji, TACHIKI Takashi, UCHIDA Takashi
IEICE technical report   108(420) 1-6   Jan 2009
In order to apply the film to high frequency devices such as a terahertz oscillator and detector, we have been fabricating a Bi_2Sr_2CaCu_2O_<8+x>(Bi-2212) thin film on a MgO substrate by the metal-organic decomposition (MOD) method which has the ...
Uchida T., Hayashi K., Tachiki T., Furuya T., Idehara T., Yasuoka Y.
ITE Technical Report   33(0) 17-22   2009
100GHz帯で動作する薄膜スロットアンテナを結合した完全薄膜型のGaAsショットキバリアダイオード(SBD)を製作し、ビデオ検波ならびにミクシング特性を中心に検討を行った。94GHz電磁波照射時のビデオ検波における検出電圧は、製作した素子の電流-電圧(I-V)特性から得られた理論的なバイアス電圧の依存性とよく一致し、アンテナで受信した信号を素子のI-V特性の非線形性により検波していることが確認できた。また、最適バイアス点での雑音等価電力密度(NEI)は約5.1×10^<-8>W/cm^2...
WATANABE Shoji, HAMANAKA Koji, TACHIKI Takashi, UCHIDA Takashi
IEICE technical report   108(152) 1-6   Jul 2008
We have been fabricating a Bi_2Sr_2CaCu_2O_<8+x> (Bi-2212) thin film on an MgO substrate in order to apply the film to high frequency devices such as a terahertz oscillator and detector. In this study, Bi-2212/MgO thin films were fabricated by the...
TACHIKI Takashi, UCHIDA Takashi
IEICE technical report   108(152) 19-23   Jul 2008
In order to fully understand a relationship between microwave-induced steps and the Josephson plasma resonance observed in Bi_2Sr_2CaC_2uO_<8+x> (Bi-2212) intrinsic Josephson Junctions, we have performed a numerical simulation using the coupled si...
UCHIYAMA Tetsuji, WATANABE Shoji, TACHIKI Takashi, UCHIDA Takashi
低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity   77    Nov 2007
WATANABE Shoji, TACHIKI Takashi, UCHIDA Takashi, UCHIYAMA Tetsuji
IEICE technical report   107(171) 1-6   Jul 2007
We focus on realizing a high quality Bi_2Sr_2CaCu_2O_<8+x>(Bi-2212) thin film fabricated on an MgO substrate in order to apply the film to high frequency devices such as a terahertz oscillator and filter. In this study, SrTiO_3(STO) thin films whi...
TACHIKI Takashi, UCHIDA Takashi
IEICE technical report   107(171) 13-17   Jul 2007
Microwave response properties of Bi_2Sr_2CaCu_2O_<8+x> long intrinsic Josephson junctions have been experimentally and theoretically investigated. we fabricated a mesa structure consisting of 14 junctions with 50 μm long and 4 μm wide, and observe...
TACHIKI Takashi, UCHIDA Takashi
IEICE technical report   106(139) 1-6   Jul 2006
In order to understand a producing mechanism of microwave-induced zero-crossing steps observed in Bi_2Sr_2CaC_2uO_<8+x> (BSCCO) intrinsic Josephson Junctions, microwave power dependence of the steps has been experimentally and theoretically invest...
TACHIKI Takashi, UCHIDA Takashi
電子情報通信学会技術研究報告. SCE, 超伝導エレクトロニクス   106(139) 1-6   Jun 2006
Fabrication of Slot-Antenna-Coupled BSCCO Intrinsic Josephson Junctions
T. Uchida, N. Kawai, T. Tachiki
Journal of the Korean Physical Society   48 1061-1065   May 2006   [Refereed]
High-Tc Superconducting YBa2Cu3O7-δ Mixers Based on the Vortex Motion
T. Uchida, T. Nishida, T. Tachiki, Y. Yasuoka
Singapore Journal of Physics   18(1) 165-169   2002   [Refereed]
High speed vortex motion in Bi_2Sr_2CaCu_2O_y intrinsic Josephson junctions fabricated by inhibiting ion implantation
K. Nakajima, T. Yamashita, S. Sudo, T. Tachiki
Physica C   341-348 1599-1600   Nov 2000   [Refereed]
The anomalous resistivity peak of intrinsic layered high-?_c superconductors
C. Buzea, T. Tachiki, S-J. Kim, H. B. Wang, Y. Uematsu, K. Nakajima, T. Yamashita, H. Sato, M. Naito
Advances in Cryogenic Engineering   46 607-614   Jun 2000   [Refereed]
Heuristic model for the anomalous resistivity peak of low- and high-temperature superconductors based on materials anisotropy
C. Buzea, T. Tachiki, T. Yamashita
Advances in Cryogenic Engineering   46 615-622   Jun 2000   [Refereed]
Josephson vortex dynamics in La???Sr_xCuO_4 single crystals
T. Tachiki, K. Nakajima, T. Yamashita, I. Tanaka, H. Kojima
Physica B   284-288 581-582   Apr 2000   [Refereed]
Flux flow of Josephson vortices in La???Sr_xCuO_4 single crystals
T. Tachiki, K. Nakajima, I. Tanaka, H. Kojima
Advances in Superconductivity   12 1117-1119   Mar 2000   [Refereed]
Microwave responses of BSCCO-2212 intrinsic Josephson junctions at frequencies up to 100 GHz
H. Wang, T. Tachiki, Y. Aruga, Y. Mizugaki, J. Chen, K. Nakajima, T. Yamashita, P. H. Wu
Advances in Superconductivity   12 1108-1110   Mar 2000   [Refereed]
TACHIKI T., NAKAJIMA K., YAMASHITA T., TANAKA I., KOJIMA H.
Technical report of IEICE. SCE   98(222) 19-23   Jul 1998
We measured voltages across micro-bridges fabricated along the c axis of La_<2-x>Sr_xCuO_4 single crystals as a function of the angle between an applied magnetic field and the ab plane. A remarkable voltage appeared when the magnetic field was ali...
Examination of the microstripline resonator for measurement of the magnetic penetration depth, λ
D. Okai, T. Tachiki, Y. Shinkai, M. Kusunoki, S. Ohshima
Advances in Superconductivity   10 1161-1164   Mar 1998   [Refereed]

Research Grants & Projects

 
Development of large-scale arrays consisting of terahertz-wave oscillators using intrinsic Josephson junctions
JSPS: Grant-in-Aid for Scientific Research (C)
Project Year: Apr 2017 - Mar 2020    Investigator(s): Takashi Tachiki
Development of high-power Terahertz-wave oscillators using stably-biased intrinsic Josephson junctions
JSPS: Grant-in-Aid for Scientific Research (C)
Project Year: Apr 2014 - Mar 2017    Investigator(s): Takashi Tachiki
Fabrication of thin-film-type terahertz-wave oscillators using intrinsic Josephson junctions
JSPS: Grant-in-Aid for Scientific Research (C)
Project Year: Apr 2011 - Mar 2014    Investigator(s): Takashi Tachiki
Preparation of High-quality Bi-2223 Single Crystal Thin Film for Intrinsic Josephson Junctions used in THz Emission
JSPS: Grant-in-Aid for Scientific Research (C)
Project Year: Apr 2009 - Mar 2012    Investigator(s): Kazuhiro Endo