Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Directional Plasmonic Excitation by Helical Nanotips

Version 1 : Received: 19 April 2021 / Approved: 20 April 2021 / Online: 20 April 2021 (12:17:26 CEST)

How to cite: Singh, L.; Maccaferri, N.; Garoli, D.; gorodetski, Y. Directional Plasmonic Excitation by Helical Nanotips. Preprints 2021, 2021040539 (doi: 10.20944/preprints202104.0539.v1). Singh, L.; Maccaferri, N.; Garoli, D.; gorodetski, Y. Directional Plasmonic Excitation by Helical Nanotips. Preprints 2021, 2021040539 (doi: 10.20944/preprints202104.0539.v1).

Abstract

The phenomenon of coupling between light and surface plasmon polaritons requires specific momentum matching conditions. In the case of a single scattering object on a metallic surface, like a nanoparticle or a nanohole, the coupling between a broadband effect, i.e. scattering, and a discrete one such as surface plasmon excitation, leads to Fano-like resonance lineshapes. The necessary phase matching requirements can be used to engineer the light-plasmon coupling and to achieve a directional plasmonic excitation. Here we investigate this effect by using a chiral nanotip to excite surface plasmons with a strong spin-dependent azimuthal variation. This effect can be described by a Fano-like interference with a complex coupling factor that can be modified thanks to a symmetry breaking of a nanostructure.

Subject Areas

plasmonics; nanotip; chiral; symmetry-breaking; directional-excitation

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