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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985882%3A_____%2F22%3A00558679" target="_blank" >RIV/67985882:_____/22:00558679 - isvavai.cz</a>

Alternative codes found

RIV/00216305:26210/22:PU144810

Result on the web

<a href="https://doi.org/10.1103/PhysRevA.105.063505" target="_blank" >https://doi.org/10.1103/PhysRevA.105.063505</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevA.105.063505" target="_blank" >10.1103/PhysRevA.105.063505</a>

Result language

angličtina

Original language name

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

Original language description

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 bound state in the continuum (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, and offer a lossless platform for PT-symmetry phase transition. We interpreted the resonant features in the scattering spectra through a generalized Weierstrass factorization. The resonance related with quasi-BIC arises from the interference between two leaky modes: one of them representing a continuum spectrum and the other (quasi-BIC) discrete state. The reflectance near the resonance can be rewritten into the form of the Fano formula where the shape parameter f can be expressed in terms of the poles associated with the two modes. Our approach provides a flexible framework which allows to interpret and to engineer the resonant properties of more complex systems.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20201 - Electrical and electronic engineering

Project

<a href="/en/project/GA19-00062S" target="_blank" >GA19-00062S: Advanced functionalities in subwavelength photonic and plasmonic structures</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Review A

ISSN

2469-9926

e-ISSN

2469-9934

Volume of the periodical

105

Issue of the periodical within the volume

6

Country of publishing house

US - UNITED STATES

Number of pages

7

Pages from-to

063505

UT code for WoS article

000809499800005

EID of the result in the Scopus database

2-s2.0-85131892287