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Time behavior of field screening effects in GaAs photoconductive antenna as a terahertz emitter
WANG Tianyi #,YANG Zhengang *,ZOU Si,WANG Shenglie,WANG Kejia,LIU Jinsong
Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074
*Correspondence author
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Funding: none
Opened online:21 October 2014
Accepted by: none
Citation: WANG Tianyi,YANG Zhengang,ZOU Si.Time behavior of field screening effects in GaAs photoconductive antenna as a terahertz emitter[OL]. [21 October 2014] http://en.paper.edu.cn/en_releasepaper/content/4612237
 
 
The field screening effects in small-size GaAs photoconductive antenna are investigated via the well-known pump and probe terahertz (THz) generation technique. The peak amplitude of the THz pulses excited by the probe laser pulse as a function of the pump-probe time delay is measured. An equivalent-circuit model is used to simulate the experimental data. Based on the good agreement between the simulation and experiment, the time behavior of the radiation and space-charge fields is simulated. The results show that the space-charge screening dominantly determines the device response in the whole time, while the radiation filed screening plays a key role in initial time which strongly affects the peak THz field. The parameter analysis is performed, which may be valuable on the optimum design for the antenna as a THz emitter.
Keywords:GaAs photoconductive antenna; field screening effects; THz emitter
 
 
 

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