Refractive index sensing with optical bound states in the continuum

Abstract

We consider refractive index sensing with optical bounds states in the continuum (BICs) in dielectric gratings. Applying a perturbative approach we derived the differential sensitivity and the figure of merit of a sensor operating in the spectral vicinity of a BIC. Optimisation design approach for engineering an effective sensor is proposed. An analytic formula for the maximal sensitivity with an optical BIC is derived. The results are supplied with straightforward numerical simulations.

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• Quasi-bound states in the continuum induced by $\mathcal{P}\mathcal{T}$-symmetry breaking
• Enhanced sensitivity of an all-dielectric refractive index sensor with optical bound state in the continuum
• Bound States in the Continuum in Multipolar Lattices
• Attoliter Mie Void Sensing
• On the robustness of bound states in the continuum in waveguides with lateral leakage channels
• Tunable collective electromagnetic induced transparency-like effect due to coupling of dual-band bound states in the continuum
• Singular value decomposition to describe bound states in the continuum in periodic metasurfaces