Generation of elliptical airy vortex beams based on all-dielectric metasurface  

作　　者：薛晓菊 徐弼军 吴白瑞 汪小刚 俞昕宁 林露 李宏强 Xiao-Ju Xue;Bi-Jun Xu;Bai-Rui Wu;Xiao-Gang Wang;Xin-Ning Yu;Lu Lin;Hong-Qiang Li(School of Science,Zhejang University of Science and Technology,Hangzhou 310023,China;Tongji University Shanghai 200092,China;Intitute of Dongguan-Tongji niversity,Dongguan 523808,China)

机构地区：[1]School of Science,Zhejiang University of Science and Technology,Hangzhou 310023,China [2]Tongji University,Shanghai 200092,China [3]Institute of Dongguan-Tongji University,Dongguan 523808,China

出　　处：《Chinese Physics B》2023年第2期347-353,共7页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 61975185);the Natural Science Foundation of Zhejiang Province, China (Grant Nos. LY19F030004 and LY20F050002)。

摘　　要：Elliptical airy vortex beams(EAVBs) can spontaneously form easily identifiable topological charge focal spots. They are used for topological charge detection of vortex beams because they have the abruptly autofocusing properties of circular airy vortex beams and exhibit unique propagation characteristics. We study the use of the dynamic phase and Pancharatnam–Berry phase principles for generation and modulation of EAVBs by designing complex-amplitude metasurface and phase-only metasurface, at an operating wavelength of 1500 nm. It is found that the focusing pattern of EAVBs in the autofocusing plane splits into |m| + 1 tilted bright spots from the original ring, and the tilted direction is related to the sign of the topological charge number m. Due to the advantages of ultra-thin, ultra-light, and small size of the metasurface, our designed metasurface device has potential applications in improving the channel capacity based on orbital angular momentum communication, information coding, and particle capture compared to spatial light modulation systems that generate EAVBs.

关 键 词：elliptical airy vortex beams(EAVBs) metasurface topological charge 

分 类 号：O436[机械工程—光学工程]