テラヘルツ帯円偏光二色性分光法による水和状態のタンパク質および液晶の動態研究

• Project/Area Number: 13F03701
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 外国
• Research Field: Applied optics/Quantum optical engineering
• Research Institution: University of Fukui
• Principal Investigator: 谷 正彦 福井大学, 遠赤外領域開発研究センター, 教授 (00346181)
• Co-Investigator(Kenkyū-buntansha): NIEHUES Gudrun 福井大学, 遠赤外領域開発研究センター, 外国人特別研究員 ; NIEHUES Gudrun 福井大学, 遠赤外領域開発研究センター, 外国人研究員
• Project Period (FY): 2013-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥2,300,000 (Direct Cost: ¥2,300,000); Fiscal Year 2014: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2013: ¥1,200,000 (Direct Cost: ¥1,200,000)
• Keywords: テラヘルツ波 / テラヘルツ時間領域分光 / 円偏光二色性

Outline of Annual Research Achievements

本研究課題「テラヘルツ帯円偏光二色性分光法による水和状態のタンパク質および液晶の動態研究」では、水和状態のタンパク質のテラヘルツ帯円偏光二色性分光を行い、タンパク質のテラヘルツ(THz)帯の固有振動モードやゆらぎなどの動態研究を行うことが最終的な目標である。水和状態のタンパク質のテラヘルツ帯円偏光二色性分光を行うためには、まずそのための装置開発が必要である。そこで、本研究では円偏光二色性分光を広い周波数帯 (数10GHz～5THz)で行うため、偏光測定を高速・広帯域・高感度で行うためのテラヘルツ時間領域分光システム(THz-TDS)の開発に取り組んだ。まず広帯域THz波発生素子として非線形光学結晶のLiNbO3を用いた素子を開発した。また広帯域THz波検出用の素子として、金属導波路構造を利用した光伝導アンテナ素子を開発した。これらの素子とWire-Grid型THz波偏光子を組み合わせ、4THzまでの周波数帯で、偏光敏感な高感度THz-TDS装置の構築を行った。また溶液系での緩和モードを測定するため数10GHz～数100GHzの低周波数帯での測定を目的としたTHz-TDSシステムの開発に取り組んだ。高出力が得られる新しいTHz波発生素子の開発のために、薄膜太陽電池の材料として知られるCu2ZnSnSe4薄膜からのTHz波発生の研究にも取り組んだ(Z. Zhao博士らとの共著論文として成果発表）。偏光敏感なTHz-TDSには従来Wire-Grid偏光子を用いた測定が行われているが、この場合、２つの偏光成分の測定のために2回測定を行う必要があり、またWire-Grid偏光子性能による制限もあった。そこでTHz波の偏光状態を測定できる多極（4極）の光伝導アンテナ素子とその偏光応答行列を用いて、Wire-Grid偏光子無しで、正確にTHz波の偏光状態を測定できる手法を開発した（論文投稿中）。

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] Terahertz surface emission from Cu2ZnSnSe4 thin film photovoltaic material excited by femtosecond laser pulses (2014)
  • Author(s): Z. Zhao, G. Niehues, S. Funkner, E. Estacio, Q. Han, K. Yamamoto, J. Zhang, W. Shi, Q. Guo, and M. Tani
  • Journal Title: Applied Physics Letters Volume: 105 Issue: 23 Pages: 231104-231104
  • DOI: 10.1063/1.4903740
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Utilization of chirped laser pulses to measure stimulated Raman scattering of organic liquids in the terahertz regime (2014)
  • Author(s): S. Funkner, K. Saito, G. Niehues, Y. Yazawa, T. Furuya, K. Yamamoto, and M. Tani
  • Journal Title: Applied Physics Letters Volume: 105 Issue: 2
  • DOI: 10.1063/1.4890092
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Terahertz Absorption of Chemicals in Water: Ideal and Real Solutions and Mixtures (2014)
  • Author(s): S. Funkner, G. Niehues, D.A. Schmidt, and E. Bruendermann
  • Journal Title: Journal of Infrared, Millimeter, and Terahertz Waves Volume: 35 Pages: 138-152
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] A polarization-sensitive 4-contact detector for terahertz time-domain sp ectroscopy (2014)
  • Author(s): Dmitry S. Bulgarevich, Makoto Watanabe, Mitsuharu Shiwa, Gudrun Niehues, Seizi Nishizawa, and Masahiko Tani
  • Journal Title: Optics Express Volume: 22 Pages: 10332-10340
  • Peer Reviewed
• [Presentation] Terahertz Wave Detection by Heterodyne EO Sampling Using Position Sensitive Detector (2014)
  • Author(s): S. Azuma, T. Nagase, S. Ozawa, S. Funkner, G. Niehues, A. Iwamae, K. Yamamoto, T. Furuya, E. Estacio, M. I. Bakunov, and M. Tani
  • Organizer: Samahang Pisika ng Pilipinas (Physics Society of the Philippines) 32nd Physics Congress (SPP 2014)
  • Place of Presentation: University of the Philippines Diliman
  • Year and Date: 2014-10-17 – 2014-10-20
• [Presentation] Measurement of Low Temperature-Grown GaAs Carrier Lifetime by Double Pump Terahertz Time-Domain Spectroscopy (2014)
  • Author(s): V. K. Mag-usara, S. Funker, G. Niehues, E. A. Prieto, A. Somintac, E. Estacio, A. Salvador, K. Yamamoto, M. Hase, and M. Tani
  • Organizer: Samahang Pisika ng Pilipinas (Physics Society of the Philippines) 32nd Physics Congress (SPP 2014)
  • Place of Presentation: University of the Philippines Diliman
  • Year and Date: 2014-10-17 – 2014-10-20
• [Presentation] Towards Broadband THz-TDS: LN Waveguide THz Emission Super Focused onto a Reversed Photoconductive Antenna (2014)
  • Author(s): G. Niehues, S. Funkner, T. Shirao, T. Furuya, T. Kishibata, T. Okuyama, Y. Akamine, K. Yamamoto, F. Kuwashima, K. Kawase, and M. Tani
  • Organizer: The 39th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2014).
  • Place of Presentation: The University of Arizona, Tucson, AZ, USA
  • Year and Date: 2014-09-14 – 2014-09-19
• [Presentation] Frequency-Resolved Detection Of Broad-band THz Waves With Cherenkov-Phase-Matched Heterodyne EO Sampling (2014)
  • Author(s): M. Tani, S. Azuma, T. Nagase, S. Ozawa, S. Funkner, G. Niehues, A. Iwamae, K. Yamamoto, T. Furuya, E. Estacio, and M. Bakunov
  • Organizer: The 39th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2014)
  • Place of Presentation: The University of Arizona, Tucson, AZ, USA
  • Year and Date: 2014-09-14 – 2014-09-19
• [Presentation] Detecting THz Signatures Of Liquids With Chirp Induced Stimulated Raman Scattering (2014)
  • Author(s): S. Funkner, G. Niehues, K. Saitou, Y. Yazawa, T. Furuya, K. Yamamoto, and M. Tani
  • Organizer: The 39th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2014)
  • Place of Presentation: The University of Arizona, Tucson, AZ, USA
  • Year and Date: 2014-09-14 – 2014-09-19
• [Presentation] THz Electro-optic Sampling Based on Non-collinear Cherenkov Phase-matching (2014)
  • Author(s): M. Tani, T. Kinoshita, T. Nagase, S. Ozawa, S. Azuma, S. Tsuzuki, D. Takeshima, T. Joja, T. Furuya, A. Iawamae, S. Funkner, G. Niehues, E. Estacio, K. Kurihara, K. Yamamoto, and M. Bakunov
  • Organizer: 7th Global Symposium on Millimeter-Waves (GSMM) 2014
  • Place of Presentation: The-K Seoul Hotel, Seoul, Korea
  • Year and Date: 2014-05-21 – 2014-05-23
  • Invited
• [Presentation] Probing THz Emission from the Solar Cell Material CZTSe (2014)
  • Author(s): Gudrun Niehues, Stefan Funkner, Yongwei Li, Elmer Estacio, Qifeng Han, Wangzhou Shi, Kohji Yamamoto, Quixin Guo, Zhenyu Zhao, and Masahiko Tani
  • Organizer: 8th Asian Conference on Ultrafast Phenomena (ACUP 2014)
  • Place of Presentation: Kobe, Japan
• [Presentation] Properties of the Solar Cell Material CZTSe as a THz Emitter (2014)
  • Author(s): Gudrun Niehues, Stefan Funkner, Yongwei Li, Elmer Estacio, Qifeng Han, Wangzhou Shi, Kohji Yamamoto, Quixin Guo, Zhenyu Zhao, and Masahiko Tani
  • Organizer: The 5th International Workshop on Far-Infrared Technologies 2014 (IW-FIRT 2014)
  • Place of Presentation: University of Fukui, Fukui, Japan
• [Presentation] Measurements using an OSREFM Fast-Scan Terahertz Time Domain Sp ectrometer (2013)
  • Author(s): Gudrun Niehues, Takashi Furuy a, Elmer S. Estacio, Kohji Yama moto, Fumiaki Miyamaru, Seiji Nishizawa, Masahiko Tani
  • Organizer: 2013年秋季第74回応用物理学会学術講演会, 講演番号16a-D4-8
  • Place of Presentation: 同志社大学京田辺キャンパス