中国物理B ›› 2023, Vol. 32 ›› Issue (2): 24215-024215.doi: 10.1088/1674-1056/ac7cd0

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

Xiao-Ju Xue(薛晓菊)1, Bi-Jun Xu(徐弼军)1,3,†, Bai-Rui Wu(吴白瑞)1, Xiao-Gang Wang(汪小刚)1, Xin-Ning Yu(俞昕宁)1, Lu Lin(林露)1, and Hong-Qiang Li(李宏强)2,3   

  1. 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
  • 收稿日期:2022-04-01 修回日期:2022-06-02 接受日期:2022-06-29 出版日期:2023-01-10 发布日期:2023-02-16
  • 通讯作者: Bi-Jun Xu E-mail:xubijun@zust.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 61975185), and the Natural Science Foundation of Zhejiang Province, China (Grant Nos. LY19F030004 and LY20F050002).

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

Xiao-Ju Xue(薛晓菊)1, Bi-Jun Xu(徐弼军)1,3,†, Bai-Rui Wu(吴白瑞)1, Xiao-Gang Wang(汪小刚)1, Xin-Ning Yu(俞昕宁)1, Lu Lin(林露)1, and Hong-Qiang Li(李宏强)2,3   

  1. 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
  • Received:2022-04-01 Revised:2022-06-02 Accepted:2022-06-29 Online:2023-01-10 Published:2023-02-16
  • Contact: Bi-Jun Xu E-mail:xubijun@zust.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 61975185), and the Natural Science Foundation of Zhejiang Province, China (Grant Nos. LY19F030004 and LY20F050002).

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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

Abstract: 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.

Key words: elliptical airy vortex beams (EAVBs), metasurface, topological charge

中图分类号:  (Optical materials)

  • 42.70.-a
78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials) 78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures) 78.68.+m (Optical properties of surfaces)