Broadband Terahertz Wave Generation from Monolayer Graphene Driven by Few-Cycle Laser Pulse
Zhong Guan1, Guo-Li Wang1*, Lei Zhang2, Zhi-Hong Jiao1, Song-Feng Zhao1, and Xiao-Xin Zhou1,3*
1College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China 2School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou 730070, China 3Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Abstract：We theoretically investigate the characteristics of terahertz (THz) radiation from monolayer graphene exposed to normal incident few-cycle laser pulses, by numerically solving the extended semiconductor Bloch equations. Our simulations show that the THz spectra in low frequency regions are highly dependent on the carrier envelope phase (CEP) of driving laser pulses. Using an optimal CEP of few-cycle laser pulses, we can obtain broadband strong THz waves, due to the symmetry breaking of the laser-graphene system. Our results also show that the strength of the THz spectra depend on both the intensity and central wavelength of the laser pulses. The intensity dependence of the THz wave can be described by the excitation rate of graphene, while wavelength dependence can be traced back to the band velocity and the population of graphene. We find that a near single-cycle THz pulse can be obtained from graphene driven by a mid-infrared laser pulse.
收稿日期: 2021-01-14
出版日期: 2021-05-02
引用本文:
. [J]. 中国物理快报, 2021, 38(5): 54201-.
Zhong Guan, Guo-Li Wang, Lei Zhang, Zhi-Hong Jiao, Song-Feng Zhao, and Xiao-Xin Zhou. Broadband Terahertz Wave Generation from Monolayer Graphene Driven by Few-Cycle Laser Pulse. Chin. Phys. Lett., 2021, 38(5): 54201-.
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