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

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.

References in corpus (6)

• Topological nature of bound states in the radiation continuum
• Interference traps waves in open system: Bound states in the continuum
• Refractive index sensing with optical bound states in the continuum
• Coupled-wave formalism for bound states in the continuum in guided-mode resonant gratings
• Critical coupling vortex with grating-induced high quality optical Tamm states
• Angular Control of Anisotropy-Induced Bound States in the Continuum

Cited by in corpus (5)

• Fabry-Perot Bound States in the Continuum in an Anisotropic Photonic Crystal
• Attoliter Mie Void Sensing
• Recovery of topologically robust merging bound states in the continuum in photonic structures with broken symmetry
• Robustness of Bound States in the Continuum in Bilayer Structures against Symmetry Breaking
• Uncovering hidden resonances in non-Hermitian systems with scattering thresholds