Tunable coupling of collective resonances in plasmonic metasurfaces for multifunctional biosensing.

Authors

Jinqing Zhang, Jiangtao Lv, Na Liu, Zhenghao Zhang, Yunjie Ma, Shutao Wang

Published in

Optics letters. Volume 51. Issue 17. Pages 4940-4943. Sep 01, 2026.

Abstract

Plasmonic bound states in the continuum (BICs) serve as an ideal platform for enhancing light-matter interactions. However, traditional BIC-based sensors predominantly utilize quasi-BICs converted from symmetry-protected BICs for sensing, whereas the sensing capabilities of accidental BICs (aBIC) remain to be explored further. In this Letter, we propose a BIC-driven plasmonic sensor that supports an aBIC arising from the coupling between a quasi-BIC and another resonant mode. Tuning far-field radiation and the interaction between plasmonic BIC and mirror-induced BIC enables accurate regulation of weak coupling. By utilizing quasi-aBICs, the proposed sensor supports pixelated molecular sensing and achieves bulk refractive index sensitivity of 544.22 nm/RIU and surface sensitivity of 16 nm/nm. This work addresses diverse sensing requirements, advancing the design of on-chip nanophotonic devices.

PMID:
42679285
Bibliographic data and abstract were imported from PubMed on 02 Sep 2026.

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