Transient surface photoconductivity of GaAs emitter studied by terahertz pump-emission spectroscopy

Yulei Shi; Qing-li Zhou; Cunlin Zhang

doi:10.1117/12.870162

4 November 2010 Transient surface photoconductivity of GaAs emitter studied by terahertz pump-emission spectroscopy

Yulei Shi, Qing-li Zhou, Cunlin Zhang

Proceedings Volume 7854, Infrared, Millimeter Wave, and Terahertz Technologies; 78543B (2010) https://doi.org/10.1117/12.870162
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

The ultrafast carrier dynamics and surface photoconductivity of unbiased semi-insulating GaAs have been investigated in detail by using terahertz pump-emission technique. Through theoretical modeling based on Hertz vector potential, it is found that transient photoconductivity plays a very important role in the temporal waveform of terahertz radiation pulse. Anomalous enhancement in both terahertz radiation and transient photoconductivity is observed subsequent to the excitation of pump pulse, and our modeling gives successful analyses for the dynamics of photogenerated carriers in the GaAs. We attribute these phenomena to carrier capture in the EL2 centers. Moreover, the pump power- and temperaturedependent measurements are also performed to verify this model.

Citation Download Citation

Yulei Shi, Qing-li Zhou, and Cunlin Zhang "Transient surface photoconductivity of GaAs emitter studied by terahertz pump-emission spectroscopy", Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 78543B (4 November 2010); https://doi.org/10.1117/12.870162

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