Efficient OAM generation at the nanoscale level by means of plasmonic vortex lens

Yuri Gorodetski, Pierfrancesco Zilio, Paolo Ponzellini, Matteo Ardini, Xavier Zambrana-Puyalto, Andrea Jacassi, Eugenio Calandrini, Denis Garoli

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Surface plasmon waves carry an intrinsic transverse spin angular momentum, which is locked to their propagation direction. On the other hand, helical plasmonic distributions may also carry an orbital angular momentum that is linked to the field topology. Apparently, when such a singular plasmonic mode propagates on a surface or is guided on a conic structure its helicity and the transverse spin can be coupled to the far-field spin and orbital angular momentum. We discuss the mechaism of such a coupling by using 2D and 3D guiding architetures. We analyze the coupling eï?ciency in each case as well as the intriguing spin-locking phenomenon occurring in our system. Finally we experimentally demonstrate the eï?cient beaming of a single-handed mode decorated by a desired orbital angular using accurately fabricated nanostructures.

Original languageEnglish
Title of host publicationPlasmonics
Subtitle of host publicationDesign, Materials, Fabrication, Characterization, and Applications XV
EditorsTakuo Tanaka, Din Ping Tsai
PublisherSPIE
ISBN (Electronic)9781510611498
DOIs
StatePublished - 2017
Event2017 SPIE Optics + Photonics conference on Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV - San Diego, United States
Duration: 6 Aug 201710 Aug 2017

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10346
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference2017 SPIE Optics + Photonics conference on Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV
Country/TerritoryUnited States
CitySan Diego
Period6/08/1710/08/17

Keywords

  • Helicity
  • Spin-orbit interaction
  • nanotip
  • polarization

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