Asymmetric Metasurfaces with High-Q Resonances Governed by Bound States in the Continuum
Asymmetric Metasurfaces with High-Q Resonances Governed by Bound States in the Continuum
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DOI：
10.1103/physrevlett.121.193903
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发表时间：
2018-11-09
影响因子：
8.6
通讯作者：
Kivshar, Yuri
中科院分区：
文献类型：
--
作者：
Koshelev, Kirill;Lepeshov, Sergey;Kivshar, Yuri
我们发现，由表面上看起来不同的晶格（电介质或金属）的平面内对称性破缺的元原子创建的超颖表面可以支持尖锐的高Q共振所产生的扭曲的连续介质保护的束缚态。我们开发了一个严格的理论，这种不对称的周期性结构，并证明了在连续和法诺共振的束缚态之间的联系。我们的研究结果建议的方式智能工程的谐振在超颖表面的纳米光子学和超光学的许多应用。
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.