Effect of symmetry breaking on bound states in the continuum in waveguide arrays

Effect of symmetry breaking on bound states in the continuum in waveguide arrays

WoS Article

We developed the theoretical framework based on the coupled-mode theory which describes spectral and scattering properties of the photonic analog of an extended Fano-Anderson model – a waveguide array with two additional side-coupled waveguides. The structure supports a rich spectrum of eigenmodes, including BIC and other bound and leaky modes, which can be classified according to the relation between the self-coupling coefficients and eigenvalues. We focus on the structures with broken vertical symmetry with their band structures revealing interesting phenomena, such as exceptional points and level repulsion. We interpreted the resonant features in the scattering spectra through a generalized Weierstrass factorization.

We developed the theoretical framework based on the coupled-mode theory which describes spectral and scattering properties of the photonic analog of an extended Fano-Anderson model – a waveguide array with two additional side-coupled waveguides. The structure supports a rich spectrum of eigenmodes, including BIC and other bound and leaky modes, which can be classified according to the relation between the self-coupling coefficients and eigenvalues. We focus on the structures with broken vertical symmetry with their band structures revealing interesting phenomena, such as exceptional points and level repulsion. We interpreted the resonant features in the scattering spectra through a generalized Weierstrass factorization.

coupled mode theory; bound states in the continuum; Fano-Andeson model

coupled mode theory; bound states in the continuum; Fano-Andeson model

PETRÁČEK, J.; KUZMIAK, V.

2023

03.06.2022

AMER PHYSICAL SOC

COLLEGE PK

2469-9926

PHYSICAL REVIEW A

105

6

United States of America

063505-1

063505-7

7

https://journals.aps.org/pra/abstract/10.1103/PhysRevA.105.063505