Phase change induced reversible high-Q near-unity circular dichroism in chiral metasurfaces

Author:

Chen Jiafei1ORCID,Cheng Yang1,Liu Xiaoshan1ORCID,Fu Guolan1,Wu Xiangman1,Liu Guiqiang1ORCID,Liu Zhengqi1ORCID

Affiliation:

1. College of Physics and Communication Electronics, Jiangxi Normal University , Nanchang 330022, Jiangxi, China

Abstract

We propose and demonstrate a chiral metasurface with capability for high Q-factor, near-unity (0.999) circular dichroism (CD) via utilization of bound states in the continuum. The CD response can be reversed with the value ranging from −0.7 to 0.82 by increasing structural perturbations to induce chiral magnetic quadrupole modes and the accompanied phase jump. In addition, more than 100-fold enhancement of C/CCPL in the superchiral near field is achieved while maintaining a high Q-factor of 105. The findings hold broad application prospects in chiral sensing, valley electronics, and ultrasensitive chiral spectroscopy detection.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Jiangxi Province

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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