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2008/04/07(Mon) 21:51

Anomalous Power and Spectrum Dependence of Terahertz Radiation from Femtosecond-Laser-Irradiated Indium Arsenide in High Magnetic Fields


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,
"Magnetic-field-induced enhancement of THz-radiation power from femtosecond-laser-iradiated InAs up to 27 T";, Jpn. J. Appl. Phys. 42 (2003) L532.