Axial Toroidal Dipole Modes in All- Dielectric Trimer Metasurfaces

A. Kupriianov, V. Tuz, V. Khardikov, W. Han, Y. Kivshar
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引用次数: 2

Abstract

We demonstrate how to excite a resonant state resembling an axial toroidal dipole in metasurfaces made of particle clusters composed of three dielectric disks (trimers). The toroidal dipole response appears due to a symmetry breaking in the cluster geometry, via an energy release from an electromagnetic trapped (dark) mode. We consider several designs of metasurfaces where an asymmetry is introduced into the cluster by either employing disks of different radii or identical disks with holes. We discuss in detail the effect of different asymmetries in metasurface's geometry on characteristics of the axial toroidal dipole response.
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全介电三聚体超表面的轴向环向偶极子模式
我们演示了如何在由三个介质盘(三聚体)组成的粒子团组成的超表面中激发类似轴向环向偶极子的共振态。环形偶极子响应的出现是由于星团几何结构中的对称性破缺,通过电磁捕获(暗)模式的能量释放。我们考虑了几种超表面的设计,其中通过使用不同半径的圆盘或带孔的相同圆盘将不对称引入簇中。详细讨论了超表面几何形状的不同不对称性对轴向环向偶极子响应特性的影响。
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