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

doi:10.1088/1674-1056/ab84d7

中国物理B ›› 2020, Vol. 29 ›› Issue (6): 64210-064210.doi: 10.1088/1674-1056/ab84d7

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

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

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)

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

收稿日期:2020-02-10 修回日期:2020-03-03 出版日期:2020-06-05 发布日期:2020-06-05
通讯作者: Liang-Liang Zhang, Yue-Jin Zhao E-mail:zhlliang@126.com;yjzhao@bit.edu.cn
基金资助:
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).

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

Received:2020-02-10 Revised:2020-03-03 Online:2020-06-05 Published:2020-06-05
Contact: Liang-Liang Zhang, Yue-Jin Zhao E-mail:zhlliang@126.com;yjzhao@bit.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: THz wave generation, DC bias electric field, ponderomotive force

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.

Key words: THz wave generation, DC bias electric field, ponderomotive force

中图分类号: (Nonlinear optics)

42.65.-k

冯世嘉, 董立泉, 马丹妮, 吴同, 谭永, 张亮亮, 张存林, 赵跃进. Excitation-wavelength-dependent THz wave modulation via external bias electric field[J]. 中国物理B, 2020, 29(6): 64210-064210.

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[J]. Chin. Phys. B, 2020, 29(6): 64210-064210.

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

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

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