Terahertz reflected waves transmitted from GaAs measured by femtosecond pump-terahertz probe spectroscopy

Qingli Zhou; Yulei Shi; Cunlin Zhang

doi:10.1117/12.900505

11 August 2011 Terahertz reflected waves transmitted from GaAs measured by femtosecond pump-terahertz probe spectroscopy

Qingli Zhou, Yulei Shi, Cunlin Zhang

Author Affiliations +

Proceedings Volume 8195, International Symposium on Photoelectronic Detection and Imaging 2011: Terahertz Wave Technologies and Applications; 81950S (2011) https://doi.org/10.1117/12.900505
Event: International Symposium on Photoelectronic Detection and Imaging 2011, 2011, Beijing, China

Abstract

Femtosecond pump-terahertz probe studies of carrier dynamics in semi-insulating GaAs have been investigated in detail under various pump powers. The pump-induced attenuation of terahertz transmission and the carrier relaxation time are found to be correlated with photo-injected carrier density. These effects can be fully explained in terms of the enhanced photoconductivity and surface states filling in GaAs. Moreover, abnormal reversal and increase of terahertz reflected waves transmitted from GaAs are observed, and these phenomena arise primarily from the pump injected carriers. One-dimensional pump scans of terahertz transmission of both the main peaks and the reflection peaks are discussed to reveal the more complete studies of the dynamics of carrier transfer in GaAs.

Citation Download Citation

Qingli Zhou, Yulei Shi, and Cunlin Zhang "Terahertz reflected waves transmitted from GaAs measured by femtosecond pump-terahertz probe spectroscopy", Proc. SPIE 8195, International Symposium on Photoelectronic Detection and Imaging 2011: Terahertz Wave Technologies and Applications, 81950S (11 August 2011); https://doi.org/10.1117/12.900505

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