Journal
ADVANCED OPTICAL MATERIALS
Volume 9, Issue 19, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202100797
Keywords
bound states in the continuum; chiral response; metasurfaces; microwave experiments; Mie resonances
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Funding
- Ministry of Science and Higher Education of the Russian Federation within the State assignment of FSRC Crystallography and Photonics of the Russian Academy of Science
- National Key R&D Program of China [2018YFE0119900]
- Australian Research Council [DP210101292]
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The study shows that metasurfaces without mirror symmetry can exhibit chiral electromagnetic response, outperforming rotationally symmetric counterparts to achieve near-lossless maximum chirality. By employing high-quality-factor resonances and a special type of BICs, the coupling of light with resonant metasurfaces can be engineered to achieve maximum chirality. Proof-of-concept experimental results confirm the prediction of maximum chiral response of the BIC-empowered asymmetric resonant dielectric metasurfaces.
Metasurfaces without a mirror symmetry may exhibit chiral electromagnetic response that differs substantially from any type of polarization transformation. A typical design of chiral metasurfaces is based on a complex arrangement of meta-atoms with chiral shapes assembled into rotationally symmetric arrays. Here it is demonstrated that, in a sharp contrast to our intuition, metasurfaces that break all point symmetries can outperform their rotationally symmetric counterparts and exhibit near-lossless maximum chirality. The authors employ the special type of high-quality-factor resonances-bound states in the continuum (BICs)-that are manifested in physical systems as quasi-BICs, and allow engineering the coupling of light with resonant metasurfaces to achieve maximum chirality. A dielectric metasurface composed of pairs of rectangular bars is designed that fully transmits one circular polarization of light and resonantly reflects the other circular polarization without any polarization conversion. Proof-of-concept experimental results that confirm directly the prediction of maximum chiral response of the BIC-empowered asymmetric resonant dielectric metasurfaces are presented.
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