Cascaded Metasurfaces for High-purity Vortex Generation

Overview

Journal Nat Commun

Specialty Biology

Date 2023 Oct 12

PMID 37828022

Authors

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

Affiliations

Soon will be listed here.

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 LG 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.

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