Optical-Electrical Characteristics and Carrier Dynamics of Semi-Insulation GaAs by Terahertz Spectroscopic Technique
Xiao-Wei Han1,2, Lei Hou1**, Lei Yang1, Zhi-Quan Wang1, Meng-Meng Zhao1, Wei Shi1**
1Department of Applied Physics, Xi'an University of Technology, Xi'an 710048 2Institute of Physical and Electrical Engineering, Weinan Normal University, Weinan 714000
Abstract：GaAs has been widely used to fabricate a variety of optoelectronic devices by virtue of its superior performance, and it is very important to accurately measure its electrical and optical properties. In this study, a semi-insulation (SI) GaAs wafer is investigated by the terahertz (THz) non-destructive testing technology. Using an air biased coherent generation and detection THz time domain spectroscopy system, the THz time domain waveform and spectrum of SI-GaAs are obtained by the time domain spectroscopy module, and its optical-electrical characteristics including complex refractive index, permittivity and dielectric loss angle are calculated. Its carrier lifetime is measured by the optical-pump THz-probe module, and the THz pulse induced intervalley scattering in photo-excited SI-GaAs is discussed.
Su F H, Blanchard F, Sharma G, Razzari L, Ayesheshim A, Cocker T L, Titova L V, Ozaki T, Kieffer J C, Morandotti R, Reid M and Hegmann F A 2009 Opt. Express17 9620
2016, Vol. 33 
