固有ジョセフソンフォトニックデバイスの数値的研究：新奇テラヘルツ帯デバイスの提案

• Project/Area Number: 12J10788
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 国内
• Research Field: Applied optics/Quantum optical engineering
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: 浅井 栄大 独立行政法人産業技術総合研究所, 電子光技術研究部門, 特別研究員(PD)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥3,630,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥330,000); Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2013: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2012: ¥1,100,000 (Direct Cost: ¥1,100,000)
• Keywords: フォトニック結晶 / 高温超伝導 / テラヘルツ波 / ジョセフソン接合 / 固有ジョセブソン接合 / メタマテリアル / 固有接合 / ジョセフソン効果

Outline of Annual Research Achievements

本年度はテラヘルツ円偏光への応答を可能にする固有接合フォトニックデバイスの提案に向けて、高温超伝導体固有接合から放射されるテラヘルツ（THz）円偏光の特性を調べた。また、新たな固有接合フォトニックデバイスの提案を念頭に、鉄系超伝導体からなるジョセフソン接合の量子トンネル特性について調べた。
昨年度はメサ型固有接合における温度の不均一性に着目し、レーザー照射等を用いた局所加熱によってTHz 波放射強度を自在に制御できる事を明らかにした。まず、本年度はその成果を更に発展させ、局所加熱によるTHz 円偏光の発生と偏光特性の変化について調べた。申請者は正方形に近い長方形型メサ型固有接合に局所加熱を行う事で、THz 円偏光が放射される事を明らかにした。また、局所加熱の位置を変化させる事で、直線偏光から円偏光へと自在に制御可能である事を明らかにした。本研究ではこれまで困難であった THz 円偏光の発生とその制御技術を提案しており、THz 波工学分野において大変重要な成果である。
更に、本年度は近年新しい固有接合系として注目を集めている鉄系超伝導体に着目し、鉄系超伝導体からなるジョセフソン接合の巨視的量子トンネル現象を調べた。鉄系超伝導体は複数の超伝導ギャップが開く多ギャップ超伝導体として知られ、その多ギャップ性に由来する新奇な量子電磁場応答の発現が期待されている。申請者は異なるギャップ間に生じる位相差揺らぎであるレゲットモードの存在がトンネル率を著しく変化させる事を見出した。本研究の成果は新たな量子光デバイス研究に繋がる大変有意義な成果である。

Research Progress Status

26年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

26年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Possibility to enhance teraherz emission from intrinsic Josephson junction by external local heating (2014)
  • Author(s): Hidehiro Asai and Shiro Kawabata
  • Journal Title: Journal of Physics: Conference Series Volume: 507 Issue: 4 Pages: 042002-042002
  • DOI: 10.1088/1742-6596/507/4/042002
  • Peer Reviewed / Open Access
• [Journal Article] Theory of macroscopic quantum tunneling with Josephson-Leggett collective excitations in multiband superconducting Josephson junctions (2014)
  • Author(s): Hidehiro Asai, Yukihiro Ota, Shiro Kawabata, Masahiko Machida, and Franco Nori
  • Journal Title: Physical Review B Volume: 89 Issue: 22
  • DOI: 10.1103/physrevb.89.224507
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Inter-band phase fluctuations in macroscopic quantum tunneling of multi-gap superconducting Josephson junctions (2014)
  • Author(s): Hidehiro Asai, Yukihiro Ota, Shiro Kawabata, and Franco Nori
  • Journal Title: Physica C Volume: 504 Pages: 81-83
  • DOI: 10.1016/j.physc.2014.02.008
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Two-dimensional macroscopic quantum tunneling in multi-gap superconductor Josephson junctions (2014)
  • Author(s): Hidehiro Asai, Shiro Kawabata, Yukihiro Ota, and Masahiko Machida
  • Journal Title: Journal of Physics: Conference Series Volume: 568 Issue: 2 Pages: 022006-022006
  • DOI: 10.1088/1742-6596/568/2/022006
  • Peer Reviewed / Open Access
• [Journal Article] Terahertz oscillating devices based upon the intrinsic Josephson junctions in a high temperature superconductor (2014)
  • Author(s): K. Delfanazari, H. Asai, M. Tsujimoto, T. Kashiwagi, T. Kitamura, K. Ishida, T. Yamamoto, M. Tachiki, R. A. Klemm, T. Hattori, K. Kadowaki
  • Journal Title: Journal of Infrared, Millimeter, and Terahertz Waves Volume: 35 Pages: 131-146
  • Peer Reviewed
• [Journal Article] Intense terahertz emission from intrinsic Josephson junctions by external heat control (2014)
  • Author(s): H. Asai and S. Kawabata
  • Journal Title: Applied Physics Letters Volume: 104 Issue: 11 Pages: 112601-112604
  • DOI: 10.1063/1.4868219
  • Peer Reviewed
• [Journal Article] Quantum terahertz electronics (QTE) using coherent radiation from high temperature superconducting Bi2Sr2CaCu208+ δ intrinsic Josephson junctions (2013)
  • Author(s): K. Kadowaki, M. Tsujimoto, K. Delfanazari, T. Kitamura, M. Sawamura, H. Asai, T. Yamamoto, K. Ishida, C. Watanabe, S. Sekimoto, K. Nakade, T. Yasui, K. Asanuma, T. Kashiwagi, H. Minami, M. Tachiki, T. Hattori, and R. A. Klemm
  • Journal Title: Physica C Volume: 491 Pages: 2-6
  • DOI: 10.1016/j.physc.2013.04.011
  • Peer Reviewed
• [Journal Article] Study of coherent and continuous terahertz wave emission in equilateral triangular mesas of superconducting Bi2Sr2CaCu208+ δ intrinsic. Josephson junctions (2013)
  • Author(s): K. Delfanazari, H. Asai, M. Tsujimoto, T. Kashiwagi, T. Kitamura, T. Yamamoto, M. Sawamura, K. Ishida, M. Tachiki, R. A. Klemm, T. Hattori, K. Kadowaki
  • Journal Title: Physica C Volume: 491 Pages: 16-19
  • DOI: 10.1016/j.physc.2012.12.009
  • Peer Reviewed
• [Journal Article] An analysis of three dimensional radiation patterns from intrinsic Josephson junctions with hot spot (2013)
  • Author(s): H. Asai M. Tachiki and K. Kadowaki
  • Journal Title: Physica C Volume: 491 Pages: 35-39
  • DOI: 10.1016/j.physc.2012.12.005
  • Peer Reviewed
• [Journal Article] An effect of temperature distribution on terahertz phase dynamics in intrinsic Josephson junctions (2013)
  • Author(s): H. Asai and S. Kawabata
  • Journal Title: Physica C Volume: 494 Pages: 121-123
  • DOI: 10.1016/j.physc.2013.04.058
  • Peer Reviewed
• [Journal Article] Vortex dynamics and matching effect in superconductors with planar pinning arrays (2013)
  • Author(s): H. Asai, S. Watanabe
  • Journal Title: Physica C Volume: 485 Pages: 125-131
  • DOI: 10.1016/j.physc.2012.11.010
  • Peer Reviewed
• [Journal Article] Tunable terahertz emission from triangular mesas in layered high Tc superconducting Bi_2Sr_2CaCu_2O_<3+b> intrinsic Josephson junctions (2013)
  • Author(s): K. Delfanazari, H. Asai, et al.
  • Journal Title: Optics Express Volume: 21 Issue: 2 Pages: 2171-2184
  • DOI: 10.1364/oe.21.002171
  • Peer Reviewed
• [Journal Article] Proposal of terahertz patch antenna fed by intrinsic Josephson junctions (2012)
  • Author(s): H. Asai, et al.
  • Journal Title: Applied Physics letters Volume: 101 Issue: 11 Pages: 112602-112605
  • DOI: 10.1063/1.4751846
  • Peer Reviewed
• [Presentation] Control of THz emission from intrinsic Josephson junction by local heating (2015)
  • Author(s): Hidehiro Asai and Shiro Kawabata
  • Organizer: Study of matter at extreme conditions (SMEC2015)
  • Place of Presentation: Miami/USA
  • Year and Date: 2015-03-08 – 2015-03-15
  • Invited
• [Presentation] Polarization Control of Terahertz Wave from Intrinsic Josephson Junctions (2014)
  • Author(s): Hidehiro Asai and Shiro Kawabata
  • Organizer: 27th International Symposium on Superconductivity
  • Place of Presentation: タワーホール船堀
  • Year and Date: 2014-11-25 – 2014-11-27
• [Presentation] Intense THz emission from high-Tc intrinsic Josephson junctions by heat control (2014)
  • Author(s): Shiro Kawabata and Hidehiro Asai
  • Organizer: Physics and Applications of Superconducting Hybrid Nano-Engineered Devices
  • Place of Presentation: Santa Maria/Italy
  • Year and Date: 2014-08-31 – 2014-09-04
  • Invited
• [Presentation] Two-dimensional macroscopic quantum tunneling in multi-gap superconductor Josephson junctions (2014)
  • Author(s): Hidehiro Asai, Shiro Kawabata, Yukihiro Ota, and Masahiko Machida
  • Organizer: 27th International Conference on Low Temperature Physics
  • Place of Presentation: Buenos Aires/Argentina
  • Year and Date: 2014-08-06 – 2014-08-13
• [Presentation] The effect of inter-band phase fluctuations on macroscopic quantum tunneling with multi-gap superconducting Josephson junctions (2014)
  • Author(s): H. Asai, S. Kawabata, Y. Ota, M. Machida, and F. Nori
  • Organizer: FIRST International Symposium on Topological Quantum Technology
  • Place of Presentation: 東京大学
  • Year and Date: 2014-01-29
• [Presentation] Intense terahertz emission from intrinsic Josephson junctions induced by external local heating (2013)
  • Author(s): H. Asai and S. Kawabata
  • Organizer: The International Symposium on Nanoscale Transport and Technology (ISNTT 2013)
  • Place of Presentation: NTT厚木研究開発センター
  • Year and Date: 2013-11-26
• [Presentation] The effect of inter-band phase fluctuation on macroscopic quantum tunneling in Josephson junctions with two-gap superconductor (2013)
  • Author(s): H. Asai and S. Kawabata
  • Organizer: 26th International Symposium on Superconductivity (ISS 2013)
  • Place of Presentation: タワーホール船堀(東京)
  • Year and Date: 2013-11-19
• [Presentation] Strong enhancement of terahertz emission induced by a self-heating effect tin intrinsic Josephson junctions (2013)
  • Author(s): H. Asai and S. Kawabata
  • Organizer: 11th European Conference of Applied Superconductivity (EUCAS 2013)
  • Place of Presentation: イタリア ジェノバ
  • Year and Date: 2013-09-18
• [Presentation] Time-dependent Ginzburg-Landau simulation on the detection mechanism of superconducting strip photon/ion detectors (2013)
  • Author(s): Y. Mawatari, H. Asai, S. Kashiwaya
  • Organizer: 11th European Conference of Applied Superconductivity (EUCAS 2013)
  • Place of Presentation: イタリア ジェノバ
  • Year and Date: 2013-09-17
• [Presentation] Inter-band uctuations in macroscopic quantum tunneling with two-band superconductors (2013)
  • Author(s): Y. Ota, F. Nori, H. Asai and S. Kawabata
  • Organizer: The 28th Quantum Information Technology Symposium
  • Place of Presentation: 北海道大学
  • Year and Date: 2013-05-28
• [Presentation] 巨視的量子トンネルにおけるバンド間超伝導位相差ゆらぎの効果 (2013)
  • Author(s): 浅井栄大, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 広島大学
  • Year and Date: 2013-03-29
• [Presentation] The enhancement of THz emission from intrinsic Josephson Junctions by heat control (2013)
  • Author(s): H. Asai, S. Kawabata
  • Organizer: Workshop on THz radiation from intrinsic Josephson junctions
  • Place of Presentation: 京都大学(招待講演)
  • Year and Date: 2013-03-10
• [Presentation] 〓erplay between Heat and THz Phase Dynamics in Intrinsic Josephson Junction (2013)
  • Author(s): H. Asai, S. Kawabata
  • Organizer: QS2C Theory Forum
  • Place of Presentation: 東京大学
  • Year and Date: 2013-01-27
• [Presentation] 〓erplay between Heat and THz Phase Dynamics in Intrinsic Josephson Junction (2012)
  • Author(s): H. Asai, S. Kawabata
  • Organizer: 25th International Symposium on Superconductivity
  • Place of Presentation: タワーホール船堀
  • Year and Date: 2012-12-05
• [Presentation] Theory of THz radiation from intrinsic Josephson junction emitter. (2012)
  • Author(s): H. Asai, et al.
  • Organizer: ow-dimensional nanoscale systems : Quantum effects, particle transport and advanced material
  • Place of Presentation: 国際ビジネスセンター(ウズベキスタン)(招待講演)
  • Year and Date: 2012-11-06
• [Presentation] 固有ジョセフソン接合アンテナのTHz波放射特性 (2012)
  • Author(s): 浅井栄大, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 横浜国立大学
  • Year and Date: 2012-09-20
• [Presentation] e-dimensional simulation of THz radiation emitted from Intrinsic Josephson junctions with hot s (2012)
  • Author(s): H. Asai, et al.
  • Organizer: PLASMA 2012
  • Place of Presentation: Cesme (トルコ)(招待講演)
  • Year and Date: 2012-06-12