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arXiv · 2111.14296

Enhanced sensitivity of an all-dielectric refractive index sensor with optical bound state in the continuum

Dmitrii N. Maksimov·Valery S. Gerasimov·Andrey A. Bogdanov·Sergey P. Polyutov
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Abstract

The sensitivity of a refractive index sensor based on an optical bound state in the continuum is considered. Applying Zel'dovich perturbation theory we derived an analytic expression for bulk sensitivity of an all-dielectic sensor utilizing symmetry protected in-$\Gamma$ optical bound states in a dielectric grating. The upper sensitivity limit is obtained. A recipe is proposed for obtaining the upper sensitivity limit by optimizing the design of the grating. The results are confirmed through direct numerical simulations.

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Dmitrii N. Maksimov, Valery S. Gerasimov, Andrey A. Bogdanov, Sergey P. Polyutov. 2021-11-29. Enhanced sensitivity of an all-dielectric refractive index sensor with optical bound state in the continuum. https://doi.org/10.1103/physreva.105.033518

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