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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Asymmetric Metasurfaces with High-Q Resonances Governed by Bound States in the Continuum
Kirill Koshelev1,2, Sergey Lepeshov2, Mingkai Liu1
1Nonlinear Physics Centre, Australian National University, Canberra ACT 2601, Australia.
Abstract:
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.
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