Bound states in the continuum in waveguide arrays within a symmetry classification scheme

0565777 - ÚFE 2023 RIV US eng J - Journal Article
Petráček, J. - Kuzmiak, Vladimír
Bound states in the continuum in waveguide arrays within a symmetry classification scheme.
Optics Express. Roč. 30, č. 20 (2022), s. 35712-35724. ISSN 1094-4087
R&D Projects: GA ČR(CZ) GA19-00062S
Institutional support: RVO:67985882
Keywords : Anderson models * Optical waveguides * Self-couplings
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 3.8, year: 2022
Method of publishing: Open access
https://doi.org/10.1364/OE.464599

We study a photonic implementation of a modified Fano-Anderson model a waveguide array with two additional waveguides and by using the coupled mode theory we calculate its spectral and scattering properties. We classify eigenmodes according to vertical symmetry of the structure given by self-coupling coefficients of the additional waveguides and establish the conditions for bound states in the continuum (BIC) existence. The main predictions drawn from the theoretical model are verified by rigorous full-wave simulations of realistic structures. We use the Weierstrass factorization theorem and interpret the scattering spectra of the systems with broken symmetry in terms of the eigenmodes. The Fano resonance related with excitation of quasi-BIC is explained as arising from the interference between this mode and another leaky mode. (c) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
Permanent Link: https://hdl.handle.net/11104/0338909