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

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 ch...

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Bibliographic Details
Published in:Applied physics letters 2024-01, Vol.124 (4)
Main Authors: Chen, Jiafei, Cheng, Yang, Liu, Xiaoshan, Fu, Guolan, Wu, Xiangman, Liu, Guiqiang, Liu, Zhengqi
Format: Article
Language:English
Subjects:
Dichroism
Metasurfaces
Q factors
Quadrupoles
Unity
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0189595