Asymmetric Metasurfaces with High-Q Resonances Governed by Bound States in the Continuum

We reveal that metasurfaces created by seemingly different lattices of (dielectric or metallic) meta-atoms with broken in-plane symmetry can support sharp high-Q resonances arising from a distortion of symmetry-protected bound states in the continuum. We develop a rigorous theory of such asymmetric...

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Bibliographic Details
Published in:Physical review letters 2018-11, Vol.121 (19), p.193903-193903, Article 193903
Main Authors: Koshelev, Kirill, Lepeshov, Sergey, Liu, Mingkai, Bogdanov, Andrey, Kivshar, Yuri
Format: Article
Language:English
Subjects:
Lattices
Metasurfaces
Periodic structures
Symmetry
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Summary:We reveal that metasurfaces created by seemingly different lattices of (dielectric or metallic) meta-atoms with broken in-plane symmetry can support sharp high-Q resonances arising from a distortion of symmetry-protected bound states in the continuum. We develop a rigorous theory of such asymmetric periodic structures and demonstrate a link between the bound states in the continuum and Fano resonances. Our results suggest the way for smart engineering of resonances in metasurfaces for many applications in nanophotonics and metaoptics.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.121.193903