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Chin. Phys. B, 2020, Vol. 29(6): 064210    DOI: 10.1088/1674-1056/ab84d7
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Excitation-wavelength-dependent THz wave modulation via external bias electric field

Shi-Jia Feng(冯世嘉)1, Li-Quan Dong(董立泉)1, Dan-Ni Ma(马丹妮)1, Tong Wu(吴同)1, Yong Tan(谭永)1, Liang-Liang Zhang(张亮亮)2, Cun-Lin Zhang(张存林)2, Yue-Jin Zhao(赵跃进)1
1 Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China;
2 Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, and Beijing Advanced Innovation Center for Imaging Technology, Department of Physics, Capital Normal University, Beijing 100048, China
Abstract  A theoretical model was proposed to describe the effects of external bias electric field on terahertz (THz) generated in air plasma. The model predicted that for a plasma in a bias electric field, the amplification effect of the THz wave intensity increases with the increase of the excitation laser wavelength. We experimentally observed the relationship between the THz enhancement effect and the electric field strength at different wavelengths. Experimental results showed a good agreement with the model predictions. These results enhance our understanding of the physical mechanism by which femtosecond lasers excite air to generate THz and extend the practical applications of THz generation and modulation.
Keywords:  THz wave generation      DC bias electric field      ponderomotive force  
Received:  10 February 2020      Revised:  03 March 2020      Published:  05 June 2020
PACS:  42.65.-k (Nonlinear optics)  
  87.50.U-  
Fund: Project supported by the Natural Science Foundation of Beijing, China (Grant No. JQ18015) and the National Natural Science Foundation of China (Grant Nos. 61935001 and 61905271).
Corresponding Authors:  Liang-Liang Zhang, Yue-Jin Zhao     E-mail:  zhlliang@126.com;yjzhao@bit.edu.cn

Cite this article: 

Shi-Jia Feng(冯世嘉), Li-Quan Dong(董立泉), Dan-Ni Ma(马丹妮), Tong Wu(吴同), Yong Tan(谭永), Liang-Liang Zhang(张亮亮), Cun-Lin Zhang(张存林), Yue-Jin Zhao(赵跃进) Excitation-wavelength-dependent THz wave modulation via external bias electric field 2020 Chin. Phys. B 29 064210

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