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- Title
Directional Plasmonic Excitation by Helical Nanotips.
- Authors
Singh, Leeju; Maccaferri, Nicolò; Garoli, Denis; Gorodetski, Yuri; Evlyukhin, Andrey B.
- 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, such as 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 the nanostructure.
- Subjects
POLARITONS; METALLIC surfaces; SYMMETRY breaking; SURFACE plasmons
- Publication
Nanomaterials (2079-4991), 2021, Vol 11, Issue 5, p1333
- ISSN
2079-4991
- Publication type
Article
- DOI
10.3390/nano11051333