Direct near-field mapping of nano-sphere-excited leaky surface modes atanisotropic metasurface: Paper

F. Walla, F. Bürkle, I. Sinev, Andrey Bogdanov, F. Komissarenko, Alinaghi Soltani, Radu Malureanu, A.V. Lavrinenko, H. G. Roskos

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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.
Original languageEnglish
Article number012165
Book seriesJournal of Physics: Conference Series
Issue number1
Number of pages3
Publication statusPublished - 2018

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