Circular-Photon-Drag-Effect-Induced Elliptically Polarized Terahertz Emission from Vertically Grown Graphene

被引：23
|
作者：
Zhu, Lipeng [1 ,2 ]
Yao, Zehan [1 ]
Huang, Yuanyuan [1 ]
He, Chuan [1 ]
Quan, Baogang [3 ,4 ]
Li, Junjie [3 ,4 ]
Gu, Changzhi [3 ,4 ]
Xu, Xinlong [1 ]
Ren, Zhaoyu [1 ]
机构：
[1] Northwest Univ, Inst Photon & Photon Technol, Int Collaborat Ctr Photoelect Technol & Nano Func, Shaanxi Joint Lab Graphene, Xian 710069, Shaanxi, Peoples R China
[2] Xian Univ Posts & Telecommun, Sch Elect Engn, Xian 710121, Shaanxi, Peoples R China
[3] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[4] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
来源：
PHYSICAL REVIEW APPLIED | 2019年 / 12卷 / 04期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
PHOTOCURRENTS;
D O I：
10.1103/PhysRevApplied.12.044063
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Circular photon drag effect (CPDE) is important for helicity-dependent optoelectronic emitters and detectors yet is less studied in graphene due to the relatively weak light-matter interaction and is submerged by other nonlinear optical effects. We give experimental evidence of CPDE in vertically grown graphene (VGG) by terahertz (THz) emission spectroscopy. The emitted THz polarization states can be tuned to linear, left-handed, and right-handed elliptical polarizations by changing the helicity of the pump laser. Polarity reversal of the THz time-domain signal occurs with the opposite helicity of pump laser excitation due to the CPDE. Theory analysis suggests that both the linear photon drag effect and CPDE-induced transient photocurrents contribute to the THz emission from which the contribution weight of CPDE can be tuned by different elliptical states of the excitation light. The photon-helicity-dependent THz emission from VGG based on CPDE offers an alternative thought of graphene-based polarization sensitive THz sources for chiral analysis in the THz field.
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页数：14
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