High Circular Dichroism Optical Chiral Metasurfaces Based on Bound States in the Continuum

Ziang Gao; Pu Wang; Shilin Yu; Zhengshan Xu; Tonggang Zhao

doi:10.3390/sym15071444

Symmetry (Jul 2023)

High Circular Dichroism Optical Chiral Metasurfaces Based on Bound States in the Continuum

Ziang Gao,
Pu Wang,
Shilin Yu,
Zhengshan Xu,
Tonggang Zhao

Affiliations

Ziang Gao: School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
Pu Wang: School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
Shilin Yu: School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
Zhengshan Xu: School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
Tonggang Zhao: School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

DOI: https://doi.org/10.3390/sym15071444
Journal volume & issue: Vol. 15, no. 7
p. 1444

Abstract

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In this paper, we suggest a design for a chiral metasurface at optical frequencies that shows a high level of circular dichroism (CD) of 0.94. By breaking the in-plane asymmetry and exciting the quasi-bound states in the continuum (quasi-BICs), a high Q-factor was obtained, which greatly enhances the interaction between light and matter. Then, the multipole decomposition was confirmed to analyze its mode of excitation. The proposed design may provide new possibilities for high-performance optical devices.

Published in Symmetry

ISSN: 2073-8994 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Mathematics
Website: http://www.mdpi.com/journal/symmetry/

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