One-dimensional quasi bound states in the continuum in the ω~k space for nonlinear optical applications

Abstract

The phenomenon of bound state in the continuum (BIC) with infinite quality factor and lifetime has emerged in recent years in photonics as a new tool of manipulating light-matter interactions. However, most of the investigated structures only support BIC resonances at very few discrete points in the w~k space. Even when the BIC is switched to a quasi-BIC(QBIC) resonance through perturbation, its frequency will still be located within a narrow spectral band close to that of the original BIC, restricting their applications in many fields where random or multiple input frequencies beyond the narrow band are required. In this work, we demonstrate that a new set of QBIC resonances can be supported by making use of a special binary grating consisting of two alternatingly aligned ridge arrays with the same period and zero-approaching ridge width difference on a slab waveguide. These QBIC resonances are distributed continuously over a broad band along a line in the w~k space and can thus be considered as one-dimensional QBICs. With the Q factors generally affected by the ridge difference, it is now possible to choose arbitrarily any frequencies on the dispersion line to achieve significantly enhanced light-matter interactions, facilitating many applications where multiple input wavelengths are required, e.g. sum or difference frequency generations in nonlinear optics.

References in corpus (4)

• Topological nature of bound states in the radiation continuum
• Metasurface engineering through bound states in the continuum
• Coupled-wave formalism for bound states in the continuum in guided-mode resonant gratings
• Robust bound states in the continuum in Kerr microcavity embedded in photonic crystal waveguide

Cited by in corpus (4)

• Spatially entangled photon-pairs from lithium niobate nonlocal metasurfaces
• Polarization engineering of entangled photons from a lithium niobate nonlinear metasurface
• Efficient photon-pair generation empowered by dual quasi-bound states in the continuum
• Dirac exciton-polariton condensates in photonic crystal gratings