Time behavior of field screening effects in small-size GaAs photoconductive terahertz antenna

The field screening effects in small-size GaAs photoconductive (PC) 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 was measured. An equiv...

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Bibliographic Details
Published in:Frontiers of Optoelectronics (Online) 2015-03, Vol.8 (1), p.98-103
Main Authors: WANG, Tianyi, YANG, Zhengang, ZOU, Si, WANG, Kejia, WANG, Shenglie, LIU, Jinsong
Format: Article
Language:English
Subjects:
Biomedical Engineering and Bioengineering
Electrical Engineering
Engineering
field screening effects
GaAs photoconductive (PC) antenna
Physics
Research Article
terahertz (THz) emitter
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Summary:The field screening effects in small-size GaAs photoconductive (PC) 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 was measured. An equivalent-circuit model was used to simulate the experimental data. Based on the good agreement between the results of simulation and experiment, the time behavior of the radiation and space-charge fields was 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 was performed, which may be valuable on the optimum design for the antenna as a THz emitter.
ISSN:2095-2759
2095-2767
DOI:10.1007/s12200-015-0488-9