BIC in waveguide arrays within a symmetry classification scheme

@article{Petravcek2022BICIW,
  title={BIC in waveguide arrays within a symmetry classification scheme},
  author={Jivr'i Petr'avcek and Vladimir Kuzmiak},
  journal={Optics Express},
  year={2022}
}
We study a photonic analog 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 eigenomodes according to vertical symmetry of the structure given by self-coupling coefficients of the additional waveguides and establish the conditions for BIC existence. We use the Weierstrass factorization theorem and interpret the scattering spectra of the systems with broken… 

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