Refractive index sensing using quasi-bound states in the continuum in silicon metasurfaces

Tom van Loon, Minpeng Liang (Corresponding author), Thomas Delplace, Bjorn Maes, Shunsuke Murai, Peter Zijlstra, Jaime Gómez Rivas (Corresponding author)

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Abstract

This work presents a bulk refractive index sensor based on quasi-bound states in the continuum (BICs) induced by broken symmetries in metasurfaces. The symmetry is broken by detuning the size and position of silicon particles periodically arranged in an array, resulting in multiple quasi-BIC resonances. We investigate the sensing characteristics of each of the resonances by measuring the spectral shift in response to changes in the refractive index of the surrounding medium. In addition, we reveal the sensing range of the different resonances through simulations involving a layer of deviating refractive index of increasing thickness. Interestingly, the resonances show very different responses, which we describe via the analysis of the near-field. This work contributes to the development of highly sensitive and selective BIC-based sensors that can be used for a wide range of applications.

Original languageEnglish
Pages (from-to)14289-14299
Number of pages11
JournalOptics Express
Volume32
Issue number8
DOIs
Publication statusPublished - 8 Apr 2024

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