All-dielectric resonant metasurfaces with a strong toroidal response

Abstract

We demonstrate how to create all-dielectric metasurfaces with a strong toroidal response by arranging two types of nanodisks into asymmetric quadrumer clusters. We demonstrate that a strong axial toroidal response of the metasurface is related to conditions of the trapped (dark) mode that is excited due the symmetry breaking in the cluster. We study the correlation between the toroidal response and asymmetry in the metasurface and nanocluster geometries, which appears from the different diameters of nanodisks or notches introduced into the nanodisks.

17 pages, 6 figures

References in corpus (7)

• High-efficiency light-wave control with all-dielectric optical Huygens' metasurfaces
• Dielectric Metamaterials with Toroidal Dipolar Response
• Toroidal metamaterial
• High-quality trapped modes in all-dielectric metamaterials
• Toroidal dipole response in a multifold double-ring metamaterial
• Toroidal optical activity
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