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- W2990581711 abstract "On periodic structures sandwiched between two homogeneous media, a bound state in the continuum (BIC) is a guided Bloch mode with a frequency within the radiation continuum. BICs are useful, since they give rise to high quality-factor ($Q$ factor) resonances that enhance local fields for diffraction problems with given incident waves. For any BIC on a periodic structure, there is always a surrounding family of resonant modes with $Q$ factors approaching infinity. We analyze field enhancement around BICs using analytic and numerical methods. Based on a perturbation method, we show that field enhancement is proportional to the square root of the $Q$ factor, and it depends on the adjoint resonant mode and its coupling efficiency with incident waves. Numerical results are presented to show different asymptotic relations between the field enhancement and the Bloch wave vector for different BICs. Our study provides a useful guideline for applications relying on resonant enhancement of local fields." @default.
- W2990581711 created "2019-12-05" @default.
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- W2990581711 date "2020-04-20" @default.
- W2990581711 modified "2023-10-18" @default.
- W2990581711 title "Resonant field enhancement near bound states in the continuum on periodic structures" @default.
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- W2990581711 doi "https://doi.org/10.1103/physreva.101.043825" @default.
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