Journal
NANOMATERIALS
Volume 11, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/nano11092357
Keywords
all-dielectric metasurfaces; bound states in the continuum; extreme Huygens' regime; chirality
Categories
Funding
- National Natural Science Foundation of China [61774062, 11674109]
- Science and Technology Planning Project of Guangdong Province, China [2017A020219007]
- Project of Department of Education of Guangdong Province, China [2019KTSCX257]
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Quasi-bound states in the continuum offer an effective way to improve metasurface performance, with low loss and polarization tunability. The proposed bifunctional resonant metasurface, based on this theory, demonstrates extreme performance and chirality under different incident light conditions.
Quasi-bound states in the continuum provide an effective and observable way to improve metasurface performance, usually with an ultra-high-quality factor. Dielectric metasurfaces dependent on Mie resonances have the characteristic of significantly low loss, and the polarization can be affected by the parameter tuning of the structure. Based on the theory of quasi-bound states in the continuum, we propose and simulate a bifunctional resonant metasurface, whose periodic unit structure consists of four antiparallel and symmetrical amorphous silicon columns embedded in a poly(methyl methacrylate) layer. The metasurface can exhibit an extreme Huygens' regime in the case of an incident plane wave with linear polarization, while exhibiting chirality in the case of incident circular polarized light. Our structure provides ideas for promoting the multifunctional development of flat optical devices, as well as presenting potential in polarization-dependent fields.
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