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Chin. Phys. B, 2020, Vol. 29(7): 078704    DOI: 10.1088/1674-1056/ab8c42
Special Issue: SPECIAL TOPIC —Terahertz physics
SPECIAL TOPIC—Terahertz physics Prev   Next  

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

Wei Shi(施卫), Rujun Liu(刘如军), Chengang Dong(董陈岗), Cheng Ma(马成)
Key Laboratory of Ultrafast Photoelectric Technology and Terahertz Science in Shaanxi, Xi'an University of Technology, Xi'an 710048, China
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      Published:  05 July 2020
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

Cite this article: 

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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