Wavelength-tunable high-Q circular dichroism based on the hybrid chiral phase-change metasurface

iScience 2026 Open access

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Authors: Xin Zhou, Yujie Zhang, Dong-Qin Zhang, Bin Fang, Gui‐Ming Pan, Zhi Hong, Zhongwei Jin, Fang-Zhou Shu
DOI: 10.1016/j.isci.2026.114631
Cited by: 4
References: 52

Abstract

(GST). The hybrid chiral metasurface exhibits a pronounced CD response when GST is in its amorphous state, with the operating wavelength being modulated as GST transitions to its crystalline state. The metasurface can support a bound state in the continuum (BIC) under conditions where the structure exhibits both in-plane mirror and inversion symmetries. By adjusting the geometric parameter to simultaneously break the in-plane mirror and inversion symmetries, the BIC is turned into a chiral quasi-BIC characterized by a high-Q factor in the CD spectrum. Furthermore, the wavelength of the chiral quasi-BIC can be dynamically tuned through the GST phase transition. This wavelength-tunable high-Q hybrid chiral metasurface holds potential applications in chiral sensing, active circular polarizers, and tunable nonlinear enhancement.

Fields of Study & Subjects

Metamaterials and Metasurfaces Applications Plasmonic and Surface Plasmon Research Phase-change materials and chalcogenides

Publication details

Journal / source
iScience
Publisher
Elsevier BV
Volume
29
Issue
2
Pages
114631–114631
Publication date
7 January 2026
Language
EN