Intrinsic Chirality of Dielectric Metasurfaces Unlocked by Resonant Chiral Modes.

Authors

Brijesh Kumar, Pavel Tonkaev, Ivan Toftul, Yihong Chen, Vaishakh Unnikrishnan, Albert Mathew, Anshuman Kumar, Furkan Kuruoglu, Filiz Yesilkoy, Yuri Kivshar

Published in

Nano letters. Volume 26. Issue 31. Pages 10321-10328. Aug 12, 2026.

Abstract

Controlling optical chirality at the subwavelength scale is essential for applications of nanophotonic structures in polarization optics, sensing, and nonlinear photonics. Achieving a strong chiroptical response in planar dielectric metasurfaces without intrinsically chiral meta-atoms remains challenging. A recent study proposed a novel mechanism of metasurface chirality and predicted that bilayer metasurfaces with rotated C4-symmetric apertures can exhibit a chiral response originating from resonant chiral photonic modes. Here, we experimentally confirm this concept by demonstrating resonantly enhanced circular dichroism in the near-infrared. We fabricated a free-standing silicon membrane metasurface that is nominally achiral. Breaking the out-of-plane symmetry with a thin PMMA layer unlocks and activates a strong chiral response. The observed circular dichroism is governed by chiral photonic modes, interlayer coupling, and symmetry breaking, in agreement with theoretical predictions. These results establish bilayer metasurfaces as a simple and versatile platform for engineering strong mode-induced chirality in compact planar photonic metadevices.

PMID:
42584244
Bibliographic data and abstract were imported from PubMed on 12 Aug 2026.

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