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

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...

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Bibliographic Details
Published in:Applied physics letters 2003-08, Vol.83 (6), p.1068-1070
Main Authors: Takahashi, Hiroshi, Quema, Alex, Yoshioka, Ryoichiro, Ono, Shingo, Sarukura, Nobuhiko
Format: Article
Language:English
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1600842