Nonlinear Physics Centre, Australian National University, Canberra ACT 2601, Australia.
ITMO University, St. Petersburg 197101, Russia.
Phys Rev Lett. 2018 Nov 9;121(19):193903. doi: 10.1103/PhysRevLett.121.193903.
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.
我们揭示了由（介电或金属）亚原子的看似不同的格子形成的超表面可以支持由于对称保护的连续体束缚态的变形而产生的尖锐的高 Q 共振。我们开发了这种非对称周期结构的严格理论，并证明了连续体中的束缚态和 Fano 共振之间的联系。我们的结果为在亚表面中智能设计共振提供了思路，这在纳米光子学和元光学中有许多应用。
