Switchable optical vortex beam generator based on an all-dielectric metasurface governed by merging bound states in the continuum

Author:

Liu Hang1,Wang Kun1,Ma Huifang1,Gao Jingxiang1,Liu Meng1ORCID,Zhang Huiyun1,Zhang Yuping1

Affiliation:

1. Shandong University of Science and Technology

Abstract

The polarization topology around the bound states in continuum (BIC) affects the optical vortex (OV) beam generation. We propose a cross-cross-shaped resonator based on a THz metasurface to realize an OV beam generator in real space by exploiting the inherent winding topology around the BIC. The BIC merging at the point Γ is achieved by tuning the width of the cross resonator, which significantly improves the Q factor and enhances the field localization. Furthermore, the switching between the high-order OV beam generator governed by the merged BIC and the low-order OV beam generator is realized. This extends the application of BIC in modulating orbital angular momentum.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Shandong Province

Science and Technology Support Plan for Youth Innovation of Colleges and Universities of Shandong Province of China

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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