Directional plasmonic excitation by helical nanotips

Leeju Singh, Nicolò Maccaferri, Denis Garoli, Yuri Gorodetski

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


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.

Original languageEnglish
Article number1333
Issue number5
StatePublished - May 2021


  • Chiral
  • Directional excitation
  • Nanotip
  • Plasmonics
  • Symmetry breaking


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