高強度テラヘルツ電磁波強度及びスペクトルの磁場依存性に関する研究
Anomalous Power and Spectrum Dependence of Terahertz Radiation from Femtosecond-Laser-Irradiated Indium Arsenide in High Magnetic Fields
フェムト秒チタンサファイヤレーザーを照射したInAs(100)基板に28Tまでの磁場を印加し，テラヘルツ電磁波の強度，及びスペクトルの変化を測定した．その結果，新たに13Tにおける飽和を発見した．また，12T以上でテラヘルツ電磁波スペクトルの振動現象を見出した．これは磁場によりInAs基板の屈折率が変化したためであると考えられる．
分子科学研究所：高橋啓司，矢野隆行，酒井雅弘，小野晋吾，猿倉信彦
東北大学　金属材料研究所：西島　元, 渡辺和雄
Magnetic-field dependence of THz-radiation power from InAs surface is investigated by using a hybrid magnet up to 28 T. It is found that THz-radiation power saturates at around 3 T and also at 13 T. This result leads to the conclusion that a magnetic field of 3 T is optimum for the enhancement of THz-radiation power. Additionally, THz-radiation spectrum exhibits periodic structure at magnetic fields above 12 T. This can be attributed to the change of dielectric constant induced by the strong magnetic field resulting in the interference of THz-radiation pulses from the front and back surfaces of the InAs substrate.
Institute for Molecular Science: H. Takahashi, T. Yano, M. Sakai, S. Ono, N. Sarukura
IMR, Tohoku University: G. Nishijima, K. Watanabe
Reference: H. Takahashi, Y. Suzuki, A. Quema, M. Sakai, T. Yano, S. Ono, N. Sarukura, M. Hosomizu, T. Tsukamoto, G. Nishijima, K. Watanabe,
ﾒMagnetic-field-induced enhancement of THz-radiation power from femtosecond-laser-iradiated InAs up to 27 Tﾓ, Jpn. J. Appl. Phys. 42 (2003) L532.