All-Dielectric Resonant Metasurfaces with a Strong Toroidal Response,ACS Photonics

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All-Dielectric Resonant Metasurfaces with a Strong Toroidal Response
ACS Photonics ( IF 6.5 ) Pub Date : 2018-03-20 00:00:00 , DOI: 10.1021/acsphotonics.8b00098
Vladimir R. Tuz _{1,

2} , Vyacheslav V. Khardikov _{1,

2,

3} , Yuri S. Kivshar ₄

Affiliation

We demonstrate how to design all-dielectric metasurfaces with a strong axial toroidal response by arranging two types of nanodisks into asymmetric quadrumer clusters. This toroidal response is related to the existence of the trapped (dark) mode that appears due to a symmetry breaking in the cluster. We uncover a correlation between the existence of the toroidal response and asymmetry in the metasurface geometries, which originates from different diameters of nanodisks or notches introduced into nanodisks. Because of the unique field configuration of the toroidal mode, the proposed metasurface could serve as a platform for efficient light–matter interaction for enhanced absorption, nonlinear response, and sensing.

中文翻译：

具有强环形响应的全介电共振超表面

我们演示了如何通过将两种类型的纳米磁盘排列成不对称的四面体簇来设计具有强轴向环形响应的全介电超表面。此环形响应与由于簇中对称性破坏而出现的陷获（暗）模式有关。我们发现超环面几何形状中环形响应的存在与不对称之间的相关性，这是由于纳米盘的不同直径或引入纳米盘的凹口而引起的。由于环形模式具有独特的场配置，因此所提出的超表面可以作为有效的光-质相互作用的平台，以增强吸收，非线性响应和感测。

更新日期：2018-03-20

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