Propagating bound states in the continuum in dielectric gratings

Abstract

We consider propagating bound states in the continuum in dielectric gratings. The gratings consist of a slab with ridges periodically arranged ether on top or on the both sides of the slab. Based on the Fourier modal approach we recover the leaky zones above the line of light to identify the geometries of the gratings supporting Bloch bound states propagating in the direction perpendicular to the ridges. Most importantly, it is demonstrated that if a two-side grating possesses either mirror or glide symmetry the Bloch bound states are stable to variation of parameters as far as the above symmetries are preserved.

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• Highly Efficient Second Harmonic Generation of Thin Film Lithium Niobate Nanograting near Bound States in the Continuum
• Coupled-wave formalism for bound states in the continuum in guided-mode resonant gratings
• Avoided crossings and bound states in the continuum in low-contrast dielectric gratings
• Hybrid Bound States in Continuum for Enhanced Sensing and Light Manipulation
• Optical bistability with bound states in the continuum in dielectric gratings
• Enhanced sensitivity of an all-dielectric refractive index sensor with optical bound state in the continuum
• Polarization-based branch selection of bound states in the continuum in dielectric waveguide modes anti-crossed by a metal grating
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• Bound States in the Continuum in Multipolar Lattices
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