Kerker Effects and Bound States in the Continuum in PT-Symmetric Dielectric Metasurfaces

We investigate the light transmission and reflection spectra of parity-time (PT) symmetric dielectric metasurfaces composed of high refractive index nanostructures with in-plane gain-loss modulation through the scattering matrix and semianalytical Cartesian multipoles methods. We find that the Kerke...

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Bibliographic Details
Published in:IEEE photonics journal 2022-08, Vol.14 (4), p.1-6
Main Authors: Fang, Zhongqing, Yang, Xiaofang, Chen, Xiaolin, Wang, Rugang, Zhou, Feng, Kong, Weibin, Chen, Chuanjie
Format: Article
Language:English
Subjects:
bound states in the continuum
Cartesian coordinates
dielectric metasurfaces
Gain-Loss
Kerker effects
Light reflection
Light transmission
Magnetic resonance
Metasurfaces
Multipoles
Optical polarization
Optical reflection
Optical refraction
Optical scattering
Optical variables control
Reflection
Refractivity
Resonance scattering
S matrix theory
Spectra
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Summary:We investigate the light transmission and reflection spectra of parity-time (PT) symmetric dielectric metasurfaces composed of high refractive index nanostructures with in-plane gain-loss modulation through the scattering matrix and semianalytical Cartesian multipoles methods. We find that the Kerker effects, i.e., the strong forward-to-backward asymmetric scattering originating from overlapping the electric and magnetic multipolar resonances, can be tailored by the gain and loss. In addition, we observe another kind of high-Q resonances, i.e., quasi-bound states in the continuum which couple to the electric and magnetic multipolar radiations, in the transmission and reflection spectra with different incident polarizations lights by manipulating the gain and loss in the metasurfaces. Our results suggest the ways to achieve Kerker effects and engineer the resonances in non-Hermitian metasurfaces for many practical applications in nanophotonics.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2022.3189025