Polarized bound state in the continuum and resonances with tunable Q-factor in an anisotropic photonic crystal

Abstract

We consider a one-dimensional photonic crystal composed of alternating layers of isotropic and anisotropic dielectric materials. Such a system has different band structures for different polarizations of light. We demonstrate that if an anisotropic defect layer is inserted into the structure, the crystal can support an optical bound state in the continuum. By tilting the principle dielectric axes of the defect layer relative to those of the photonic crystal we observe a long-lived resonance in the transmission spectrum. We derive an analytical expression for the decay rate of the resonance that agrees well with the numerical data by the Berreman anisotropic transfer matrix approach. An experimental set-up with a liquid crystal defect layer is proposed to tune the Q-factor of the resonance through applying an external electric field. We speculate that the set-up provides a simple and robust platform for observing optical bound states in the continuum in the form of resonances with tunable Q-factor.

arXiv comment8 pages, 5 figures

References in corpus (11)

• Resonantly Trapped Bound State in the Continuum Laser
• Observation of bound states in Lieb photonic lattices
• Electro-optically tunable microring resonators in lithium niobate
• Compact surface Fano states embedded in the continuum of waveguide arrays
• Anisotropy-induced photonic bound states in the continuum
• Coexistence of quantized and non-quantized geometric phases in quasi-one-dimensional systems without inversion symmetry
• Formation Mechanism of Guided Resonances and Bound States in the Continuum in Photonic Crystal Slabs
• Light enhancement by quasi-bound states in the continuum in dielectric arrays
• Chiral bound states in the continuum
• Resonant electromagnetic scattering in anisotropic layered media
• Chiral Optical Tamm States: Temporal Coupled-Mode Theory

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• Coupled-wave formalism for bound states in the continuum in guided-mode resonant gratings
• Topological properties of bound-states-in-the-continuum in geometries with broken anisotropy-symmetry
• Brewster quasi bound states in the continuum in all-dielectric metasurfaces from single magnetic-dipole resonance meta-atoms
• Angular Control of Anisotropy-Induced Bound States in the Continuum
• Fabry-Perot Bound States in the Continuum in an Anisotropic Photonic Crystal
• Fano feature induced by a bound state in the continuum via resonant state expansion
• Chiral Optical Tamm States at the Interface between a Cholesteric and an All-Dielectric Polarization-Preserving Anisotropic Mirror
• Bound state in the continuum in an anisotropic photonic crystal supported by full-wave phase plate
• Exploring the route from leaky Berreman modes to bound states in continuum
• Solitary Spectrally-Discrete Bound States in the Continuum in an Open System
• Surface Bound States in the Continuum in Dyakonov Structures