Solitary Spectrally-Discrete Bound States in the Continuum in an Open System

Abstract

Bound states in the continuum (BICs) exist in a variety of physical systems where they appear as lossless propagating states surrounded by radiating modes. However, in the case of open systems, they coexist with continuous families of guided states, which may be modes or other BICs, located in different regions of the frequency-momentum parameter space. Here we report that waveguiding structures comprising anisotropic materials with two radiation channels where continuous families of modes are not possible whatsoever can support discrete BICs that exist for a single frequency and a single propagation direction. The results are isolated spectrally-discrete BIC states existing as lossless needles emerging from a sea of radiating leaky modes.

References in corpus (28)

• Asymmetric metasurfaces with high-$Q$ resonances governed by bound states in the continuum
• Resonantly Trapped Bound State in the Continuum Laser
• Topological nature of bound states in the radiation continuum
• Topologically Enabled Ultra-high-Q Guided Resonances Robust to Out-of-plane Scattering
• High-Q supercavity modes in subwavelength dielectric resonators
• Observation of intrinsic chiral bound states in the continuum
• 1.5 $\mu$m lasers with sub 10 mHz linewidth
• Nonradiating Photonics with Resonant Dielectric Nanostructures
• Formation of Bound States in the Continuum in Hybrid Plasmonic-Photonic Systems
• Giant nonlinear response at the nanoscale driven by bound states in the continuum
• Interference traps waves in open system: Bound states in the continuum
• Anisotropy-induced photonic bound states in the continuum
• Zero-index bound states in the continuum
• Observation of surface states with algebraic localization
• Bound states in the continuum in symmetric and asymmetric photonic crystal slabs
• Light trapping above the light cone in one-dimensional array of dielectric spheres
• Bound states in the continuum through environmental design
• Bound states in the continuum with high orbital angular momentum in a dielectric rod with periodically modulated permittivity
• Polarized bound state in the continuum and resonances with tunable Q-factor in an anisotropic photonic crystal
• Robust bound states in the continuum in Kerr microcavity embedded in photonic crystal waveguide
• Topological properties of bound-states-in-the-continuum in geometries with broken anisotropy-symmetry
• Controlling Directionality and Dimensionality of Wave Propagation through Separable Bound States in the Continuum
• Capturing Broadband Light in a Compact Bound State in the Continuum
• Coherent-perfect-absorber and laser for bound states in a continuum
• Two-groove narrowband transmission filter integrated in a slab waveguide
• Angular Control of Anisotropy-Induced Bound States in the Continuum
• Unidirectional guided resonances in anisotropic waveguides
• Surface Bound States in the Continuum in Dyakonov Structures