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

著者: Kirill Koshelev, Sergey Lepeshov, Mingkai Liu, Andrey Bogdanov, Yuri S. Kivshar - Physical Review Letters 2018 被引用: 1,983

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.