期刊
IEEE PHOTONICS JOURNAL
卷 14, 期 4, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2022.3189025
关键词
Metasurfaces; Optical reflection; Optical scattering; Optical refraction; Optical variables control; Optical polarization; Reflection; Kerker effects; bound states in the continuum; dielectric metasurfaces
资金
- National Natural Science Foundation of China [11801492, 62105087, 61905059]
- Colleges and Universities Natural Science Foundation in Jiangsu Province [19KJA110002]
- Jiangsu Provincial Natural Science Foundation [BK20181050]
- Natural science research project of universities in Jiangsu Province [18KJD510010, 19KJB510061, 19KJB120014, 20KJB140025]
This study investigates the light transmission and reflection spectra of parity-time symmetric dielectric metasurfaces, and explores the manipulation of Kerker effects and resonances through gain and loss modulation. These findings have important implications for practical applications in nanophotonics.
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.
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