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Excitation-wavelength-dependent THz wave modulation via external bias electric field |
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| Authors: | Shi-Jia Feng Li-Quan Dong Dan-Ni Ma Tong Wu Yong Tan Liang-Liang Zhang Cun-Lin Zhang Yue-Jin Zhao |
| Institution: | (Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;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. |
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