Optically transparent chiral absorption enabled by accidental quasibound states in the continuum
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Updated: Nov 1, 2026

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
Published on: February 27, 2019
Wenxing Liu1, Jiaojun Meng1, Yongqiang Chen2
1School of Physics and Material Science & Jiangxi Provincial Key Laboratory of Photodetectors, Nanchang University, Nanchang 330031, China.
Abstract:
Enhanced chiral absorption in nanostructures has widespread applications in chiral sensing, photodetection, and polarized imaging. In this work, we theoretically analyze and numerically demonstrate that an all-dielectric planar chiral metasurface enables strong chiral absorption within a transparent band by engineering multipolar Mie resonances into an accidental quasibound state in the continuum (quasi-BIC). The quasi-BIC mode exhibits a sharp π phase shift for one circular polarization while remaining nearly invisible in the transmission spectrum. Upon introducing a small material loss, this mode decouples completely from the orthogonal polarization, yielding near-unity chiral absorption. This work offers new insights into quasi-BIC-assisted chiroptical effects and provides a promising platform for compact chiral photonic devices.
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