Open AccessSub-wavelength confinement of the orbital angular momentum of light probed by plasmonic nanorods resonances
Author(s) -
Marta Carli,
Pierfrancesco Zilio,
Denis Garoli,
V. Giorgis,
Filippo Romanato
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.026302
Subject(s) - plasmon , nanorod , optics , near field scanning optical microscope , plasmonic lens , surface plasmon , wavelength , angular momentum , materials science , surface plasmon polariton , nanoscopic scale , optoelectronics , optical vortex , physics , optical microscope , nanotechnology , scanning electron microscope , beam (structure) , quantum mechanics
We discuss how the topological charge of an OAM-carrying plasmon (Plasmonic Vortex) can be probed by monitoring the near-field response of plasmonic nanostructures suitably arranged inside a Plasmonic Vortex Lens. The turning "on" or "off" of four gold nanorods, detected by a Scanning Near field Optical Microscope (SNOM), acts as a fingerprint of the OAM state of the PV at the nanoscale. Different configurations are studied numerically, the integrated structure is fabricated and near field characterization is performed for a particularly meaningful case.