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physics.optics2024
Perturbation theory for resonant states near a bound state in the continuum
Nan Zhang, Ya Yan Lu
In this work, we develop a perturbation theory to analyze resonant states near a bound state in the continuum (BIC) in photonic crystal slabs. The theory allows us to rigorously de…
physics.comp-ph2024
An efficient method for calculating resonant modes in biperiodic photonic structures
Nan Zhang, Ya Yan Lu
Many photonic devices, such as photonic crystal slabs, cross gratings, and periodic metasurfaces, are biperiodic structures with two independent periodic directions, and are sandwi…