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Cascaded metasurfaces for high-purity vortex generation

Author

Listed:
  • Feng Mei

    (Harbin Institute of Technology Shenzhen)

  • Geyang Qu

    (Pengcheng Laboratory)

  • Xinbo Sha

    (Harbin Institute of Technology Shenzhen)

  • Jing Han

    (Harbin Institute of Technology Shenzhen)

  • Moxin Yu

    (Harbin Institute of Technology Shenzhen)

  • Hao Li

    (Harbin Institute of Technology Shenzhen)

  • Qinmiao Chen

    (Harbin Institute of Technology Shenzhen)

  • Ziheng Ji

    (Harbin Institute of Technology Shenzhen)

  • Jincheng Ni

    (National University of Singapore)

  • Cheng-Wei Qiu

    (National University of Singapore)

  • Qinghai Song

    (Harbin Institute of Technology Shenzhen
    Pengcheng Laboratory)

  • Yuri Kivshar

    (Australian National University
    Harbin Engineering University)

  • Shumin Xiao

    (Harbin Institute of Technology Shenzhen
    Pengcheng Laboratory
    Shanxi University)

Abstract

We introduce a new paradigm for generating high-purity vortex beams with metasurfaces. By applying optical neural networks to a system of cascaded phase-only metasurfaces, we demonstrate the efficient generation of high-quality Laguerre-Gaussian (LG) vortex modes. Our approach is based on two metasurfaces where one metasurface redistributes the intensity profile of light in accord with Rayleigh-Sommerfeld diffraction rules, and then the second metasurface matches the required phases for the vortex beams. Consequently, we generate high-purity LGp,l optical modes with record-high Laguerre polynomial orders p = 10 and l = 200, and with the purity in p, l and relative conversion efficiency as 96.71%, 85.47%, and 70.48%, respectively. Our engineered cascaded metasurfaces suppress greatly the backward reflection with a ratio exceeding −17 dB. Such higher-order optical vortices with multiple orthogonal states can revolutionize next-generation optical information processing.

Suggested Citation

  • Feng Mei & Geyang Qu & Xinbo Sha & Jing Han & Moxin Yu & Hao Li & Qinmiao Chen & Ziheng Ji & Jincheng Ni & Cheng-Wei Qiu & Qinghai Song & Yuri Kivshar & Shumin Xiao, 2023. "Cascaded metasurfaces for high-purity vortex generation," Nature Communications, Nature, vol. 14(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-42137-1
    DOI: 10.1038/s41467-023-42137-1
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    References listed on IDEAS

    as
    1. Ahmed H. Dorrah & Noah A. Rubin & Michele Tamagnone & Aun Zaidi & Federico Capasso, 2021. "Structuring total angular momentum of light along the propagation direction with polarization-controlled meta-optics," Nature Communications, Nature, vol. 12(1), pages 1-13, December.
    2. Peng Chen & Ling-Ling Ma & Wei Hu & Zhi-Xiong Shen & Hari Krishna Bisoyi & Sai-Bo Wu & Shi-Jun Ge & Quan Li & Yan-Qing Lu, 2019. "Chirality invertible superstructure mediated active planar optics," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
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