Excitation fluence dependence of terahertz radiation mechanism from femtosecond-laser-irradiated InAs under magnetic field

Takahashi, Hiroshi; Quema, Alex; Yoshioka, Ryoichiro; Ono, Shingo; Sarukura, Nobuhiko
August 2003
Applied Physics Letters;8/11/2003, Vol. 83 Issue 6, p1068
Academic Journal
The excitation fluence and magnetic field dependence of terahertz (THz) radiation power from InAs is investigated. At low excitation fluence, an enhancement of the THz-radiation power is observed independent of the magnetic-field direction. As the excitation fluence is increased, a crossover of the terahertz radiation mechanism is observed. At excitation fluence above this crossover, the radiation power is either enhanced or reduced depending on the magnetic-field direction. These results are explained by considering the different THz-radiation mechanisms from the InAs surface with or without photoexcited carrier screening. © 2003 American Institute of Physics.


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