A new nonlinear photoconductive terahertz radiation source based on photon-activated charge domain quenched mode

doi:10.1088/1674-1056/ab8c42

Abstract We present a high-performance terahertz (THz) radiation source based on the photon-activated charge domain (PACD) quenched mode of GaAs photoconductive antennas (GaAs PCA). The THz radiation characteristics of the GaAs PCA under different operating modes are studied. Compared with the linear mode, the intensity of THz wave radiated by the GaAs PCA can be greatly enhanced due to the avalanche multiplication effect of carriers in the PACD quenched mode. The results show that when the carrier multiplication ratio is 16.92, the peak-to-peak value of THz field radiated in the PACD quenched mode increases by as much as about 4.19 times compared to the maximum values in the linear mode.

Keywords: photoconductive antenna terahertz time-domain spectroscopy photon-activated charge domain quenched mode

Received: 27 March 2020
Revised: 16 April 2020
Accepted manuscript online:

PACS:	78.47.J-	(Ultrafast spectroscopy (<1 psec))
	87.50.U-

Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0701005), the National Natural Science Foundation of China (Grant Nos. 61427814 and 51807161), and the Natural Science Foundation of Shaanxi Province, China (Grant No. 2019JZ-04).

Corresponding Authors: Wei Shi
E-mail: swshi@mail.xaut.edu.cn

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Wei Shi(施卫), Rujun Liu(刘如军), Chengang Dong(董陈岗), Cheng Ma(马成) A new nonlinear photoconductive terahertz radiation source based on photon-activated charge domain quenched mode 2020 Chin. Phys. B 29 078704

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A new nonlinear photoconductive terahertz radiation source based on photon-activated charge domain quenched mode

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