Optically transparent chiral absorption enabled by accidental quasibound states in the continuum.

Authors

Wenxing Liu, Jiaojun Meng, Yongqiang Chen, Tianbao Yu

Published in

Optics letters. Volume 51. Issue 21. Pages 6038-6041. Nov 01, 2026. Epub Oct 02, 2026.

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.

PMID:
42962117
Bibliographic data and abstract were imported from PubMed on 31 Oct 2026.

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