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arXiv · 2003.04047

Ultra-sensitive Light Confinement Driven by Multiple Bound States in the Continuum

Harsh K. Gandhi·Arnab Laha·Somnath Ghosh
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Abstract

We propose a unique framework to study the topological properties of an optical bound state in the continuum(BIC). We employ the interactions between proximity resonances undergoing avoided resonance crossing in a specialty optical microcavity. We utilize a continuous system parameter tuning to induce destructive interference between the resonances with cancelling leakage losses. Similar to the physical insight of Friedrich-Wingten type-BIC, we demonstrate the evolution of an ultra-high quality mode. We report the formation of a special-BIC line in the system parameter space connecting locations of multiple quasi-BICs. Aiming to develop a novel scheme to enhance the performance of optical sensing in microcavity, we study the sensitivity of transmission coefficients and quality factor to sense even ultra-small perturbations in the system configuration.

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Harsh K. Gandhi, Arnab Laha, Somnath Ghosh. 2020-03-09. Ultra-sensitive Light Confinement Driven by Multiple Bound States in the Continuum. https://doi.org/10.1103/physreva.102.033528

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