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Oscillation effect in frequency domain current from a photoconductive antenna via a double-probe-pulse terahertz detection technique
Qi Jin,Jinsong Liu,Kejia Wang *,Zhengang Yang,Shenglie Wang,Kefei Ye
Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074
*Correspondence author
#Submitted by
Subject:
Funding: Wuhan applied basic research project (No.No. 20140101010009), Hubei Natural Science Foundation (No.No. 2012FFA074 and 2013BAA002), Technology Innovation Foundation From Innovation Institute of Huazhong University of Science and Technology (No.No. CXY13Q015), Fundamental Research Funds for the Central Universities (No.No. 2013KXYQ004, 2014ZZGH021, 2014QN023), National Natural Science Foundation (No.No. 61177095, 61475054, 61405063)
Opened online: 8 October 2014
Accepted by: none
Citation: Qi Jin,Jinsong Liu,Kejia Wang.Oscillation effect in frequency domain current from a photoconductive antenna via a double-probe-pulse terahertz detection technique[OL]. [ 8 October 2014] http://en.paper.edu.cn/en_releasepaper/content/4611750
 
 
Via constructing a special terahertz (THz) time domain spectroscopy system in which two femtosecond (fs) laser pulses are used as probe pulses to excite a photoconductive THz detector, the time behavior of the current from the detector is measured. The corresponding theoretical analysis is performed by the use of a well-known equivalent-circuit model. When the time domain current is transformed to frequency domain, an oscillation effect is observed. The oscillation frequency is decided by the time delay between the two probe pulses. The number of the extrema in the frequency domain current curve is proportion to the pulse interval in 0.1~2THz. A method to measure the interval of fs laser pulses is proposed.
Keywords:Terahertz; Photoconductivity; Frequency Oscillation
 
 
 

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