2018/01/22 by Vladimir R. Tuz, Vyacheslav V. Khardikov, Yuri S. Kivshar · 164 citations
Engineering · Materials Science · Physics and Astronomy · #Acoustic Wave Phenomena Research #Asymmetry #Field (mathematics) #Metamaterials and Metasurfaces Applications #Nonlinear system #Plasmonic and Surface Plasmon Research #Symmetry (geometry) #Symmetry breaking #Toroid #physics.optics
paper · pdf · doi:10.1021/acsphotonics.8b00098
published in ACS Photonics 5(5), 1871-1876 (American Chemical Society) · 17 pages, 6 figures
arxiv created 2018/01/22 · openalex created_date 2018/02/02 · openalex publication_date 2018/03/20 · arxiv updated 2018/06/25 · openalex updated_date 2026/08/05
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.