Quasi Bound States in the Continuum with Few Unit Cells of Photonic Crystal Slab

Abstract

Bound states in the continuum (BICs) in photonic crystal slabs represent the resonances with an infinite quality(Q)-factor, occurring above the light line for an infinitely periodic structure. We show that a set of BICs can turn into quasi-BICs with a very high Q-factor even for two or three unit cell structures. They are explained by a viewpoint of BICs originating from the tight binding of individual resonances of each unit cell as in semiconductors. Combined with a reciprocal-space matching technique, the microcavities based on quasi-BICs can achieve a Q-factor as high as defect-based PhC microcavities. These results may enable experimental studies of BICs in a compact platform as well as realizing a new concept of high-Q mirrorless microcavities.

arXiv comment4 pages, 5 figures

References in corpus (10)

• Resonantly Trapped Bound State in the Continuum Laser
• Topological nature of bound states in the radiation continuum
• Analytical Perspective for Photonic Bound States in the Continuum in Photonic Crystal Slabs
• AlGaAs-On-Insulator Nonlinear Photonics
• Compact surface Fano states embedded in the continuum of waveguide arrays
• Observation of resonance trapping in an open microwave cavity
• Slow-light enhanced gain in active photonic crystal waveguides
• Vertical-Cavity In-plane Heterostructures: Physics and Applications
• Strong Optical Confinement between Non-periodic Flat Dielectric Gratings
• Numerical Investigation of Vertical Cavity Lasers with Subwavelength Gratings Using the Fourier Modal Method

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