Conference paper · Journal article
Direct near-field mapping of nano-sphere-excited leaky surface modes atanisotropic metasurface: Paper
Johann Wolfgang Goethe-Universität Frankfurt1
St. Petersburg National Research University of Information Technologies, Mechanics and Optics (ITMO)2
Department of Photonics Engineering, Technical University of Denmark3
Metamaterials, Department of Photonics Engineering, Technical University of Denmark4
Leaky surface modes on an ultra-thin anisotropic gold metasurface are directly observed through scattering-type scanning near-field optical microscopy (s-SNOM). Surface modes are excited by focussing light onto a resonant silicon nano-sphere positioned on the surface by nano-manipulation under electron-beammonitoring.
The light scattered from the nano-sphere is ableto excitesurface modes with a broad range of wavevectors. The asymmetric air-metasurface-insulator structure supports a leaky surface mode which is confined at the top interface and leaks into the higher-index substrate. s-SNOM near-field mapping of the leaky surface wave is in good agreement with the results of the full-wave simulationsof the electro-magnetic modes on the structure.
Language: | English |
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Publisher: | IOP Publishing |
Year: | 2018 |
Pages: | 012165 |
ISSN: | 17426596 and 17426588 |
Types: | Conference paper and Journal article |
DOI: | 10.1088/1742-6596/1092/1/012165 |
ORCIDs: | Malureanu, Radu and Lavrinenko, A.V. |