Formation mechanism of guided resonances and bound states in the continuum in photonic crystal slabs
Author(s)Gao, Xingwei; Chen, Hongsheng; Hsu, Chia Wei; Zhen, Bo; Lin, Xiao; Joannopoulos, John; Soljacic, Marin; ... Show more Show less
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We develop a formalism, based on the mode expansion method, to describe the guided resonances and bound states in the continuum (BICs) in photonic crystal slabs with one-dimensional periodicity. This approach provides analytic insights to the formation mechanisms of these states: the guided resonances arise from the transverse Fabry–Pérot condition, and the divergence of the resonance lifetimes at the BICs is explained by a destructive interference of radiation from different propagating components inside the slab. We show BICs at the center and on the edge of the Brillouin zone protected by symmetry, BICs at generic wave vectors not protected by symmetry, and the annihilation of BICs at low-symmetry wave vectors.
DepartmentMassachusetts Institute of Technology. Institute for Soldier Nanotechnologies; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Research Laboratory of Electronics
Nature Publishing Group
Gao, Xingwei et al. “Formation Mechanism of Guided Resonances and Bound States in the Continuum in Photonic Crystal Slabs.” Scientific Reports 6.1 (2016): n. pag.
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