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Photopatterned liquid crystal mediated terahertz Bessel vortex beam generator [Invited]

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Abstract

In this Letter, we propose that the photopatterned liquid crystal (LC) can act as a broadband and efficient terahertz (THz) Bessel vortex beam (BVB) generator. The mechanism lies in the frequency-independent geometric phase modulation induced by the spatially variant LC directors. By adopting large birefringence LCs and optimizing the cell gap, the maximized mode conversion efficiency can be continuously adjusted in broadband. Furthermore, the LC patterns can be designed and fabricated at will, which enables the THz BVBs to carry various topological charges. Such a THz LC BVB generator may facilitate the advanced THz imaging and communication apparatus.

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DOI:10.3788/COL202018.080003

所属栏目:Special Issue on Soft-matter Photonics

基金项目:This work was supported by the National Natural Science Foundation of China (NSFC) (No. 61922038) and the Fundamental Research Funds for the Central Universities (No. 14380170).

收稿日期:2020-05-20

录用日期:2020-06-10

网络出版日期:2020-07-10

作者单位    点击查看

申彦春:Department of Physics, Capital Normal University, Beijing 100048, China
沈志雄:Key Laboratory of Intelligent Optical Sensing and Manipulation, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
赵国忠:Department of Physics, Capital Normal University, Beijing 100048, China
胡伟:Key Laboratory of Intelligent Optical Sensing and Manipulation, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China

联系人作者:胡伟(huwei@nju.edu.cn)

备注:This work was supported by the National Natural Science Foundation of China (NSFC) (No. 61922038) and the Fundamental Research Funds for the Central Universities (No. 14380170).

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引用该论文

Yanchun Shen, Zhixiong Shen, Guozhong Zhao, Wei Hu, "Photopatterned liquid crystal mediated terahertz Bessel vortex beam generator [Invited]," Chinese Optics Letters 18(8), 080003 (2020)

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