Ultrafast carrier transport in GaAs measured by optical pump-terahertz probe spectroscopy

Hai-yan Yang; Yu-lei Shi; Qing-li Zhou; Dong-mei Zhao; Lei Li; Cun-lin Zhang

doi:10.1117/12.838020

18 November 2009 Ultrafast carrier transport in GaAs measured by optical pump-terahertz probe spectroscopy

Hai-yan Yang, Yu-lei Shi, Qing-li Zhou, Dong-mei Zhao, Lei Li, Cun-lin Zhang

Proceedings Volume 7512, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security; 75120K (2009) https://doi.org/10.1117/12.838020
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

Abstract

Femtosecond optical pump-terahertz probe studies of carrier dynamics and transport characteristics in semi-insulating GaAs have been investigated under different pump powers at room temperature. The transmission of the terahertz pulse is monitored as a function of delay time between pump and probe pulse, we found that because the more optical generated carriers under the higher power, the terahertz transmission decreased with the increase of the optical pump power. Using a simple thin-film Drude model, carrier relaxation times and carrier mobilities were obtained by fitting the differential transmission curves. The time-dependent and frequency-dependent conductivities also have been studied.

Citation Download Citation

Hai-yan Yang, Yu-lei Shi, Qing-li Zhou, Dong-mei Zhao, Lei Li, and Cun-lin Zhang "Ultrafast carrier transport in GaAs measured by optical pump-terahertz probe spectroscopy", Proc. SPIE 7512, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security, 75120K (18 November 2009); https://doi.org/10.1117/12.838020

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