Oscillation effect in frequency domain current from a photoconductive antenna via double-probe-pulse terahertz detection technique

doi:10.1007/s12200-015-0491-1

Front. Optoelectron.

2015, Vol. 8

Issue (1) : 104-109 https://doi.org/10.1007/s12200-015-0491-1

RESEARCH ARTICLE

Oscillation effect in frequency domain current from a photoconductive antenna via 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 Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

Via constructing a special terahertz time domain spectroscopy (THz-TDS) system in which two femtosecond (fs) laser pulses were used as probe pulses to excite a photoconductive (PC) THz detector, the time behavior of the current from the detector was measured. The corresponding theoretical analysis was performed by a well-known equivalent-circuit model. When the time domain current was transformed to frequency domain, an oscillation effect was observed. The oscillation frequency was decided by the time delay between the two probe pulses. The number of the extrema in the frequency domain current curve was proportion to the pulse interval in 0.1-2 THz. A method to measure the interval of fs laser pulses was proposed. It is important for applications of fs laser pulses or train.

Keywords terahertz (THz) photoconductivity frequency oscillation

Corresponding Author(s): Kejia WANG

Just Accepted Date: 14 January 2015 Online First Date: 04 February 2015 Issue Date: 13 February 2015

Cite this article:

Qi JIN,Jinsong LIU,Kejia WANG, et al. Oscillation effect in frequency domain current from a photoconductive antenna via double-probe-pulse terahertz detection technique[J]. Front. Optoelectron., 2015, 8(1): 104-109.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-015-0491-1
https://academic.hep.com.cn/foe/EN/Y2015/V8/I1/104

Fig.1 Experimental setup. fs: femtosecond; BS: beam splitter; HWP: half-wave plate; PBS: polarization beam splitter; PC: photoconductive

Fig.2 Normalized measured time domain current (inset red lines) and the corresponding normalized frequency domain current (black lines) under different τ 1 , 2 . (a) 0 ps; (b) 1 ps; (c) 2 ps; (d) 3 ps; (e) 4 ps; (f) 5 ps

Fig.3 Normalized current J as a function of τ and its corresponding Fourier transform amplitude (Observation: black lines, and simulation: red lines). (a) and (b) for τ 1 , 2 = 2 ps, (c) and (d) for τ 1 , 2 = 5 ps

Fig.4 Relation between the pulse interval and the number of minima in frequency domain current curves

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