Bound states in the continuum in the multipole approximation

Sergei Gladyshev,Artem Shalev,Kristina Frizyuk,Konstantin Ladutenko,Andrey Bogdanov

METAMATERIALS XIII（2022）

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摘要

Here we develop a theory of bound states in the continuum (BICs) in multipolar lattices - periodic arrays of resonant multipoles. We show that off-BIC can be pinned in the k-space in this multipole approximation. The developed approach set a direct relation between the topological charge of BIC and the asymptotic behavior of Q-factor of the radiative modes in its vicinity.

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关键词

bound state in the continuum, multipolar lattice, topological charge

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