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.
Sub-wavelength confinement of the orbital angular momentum of light probed by plasmonic nanorods resonances / Carli, Marta; Zilio, Pierfrancesco; Garoli, Denis; V., Giorgis; Romanato, Filippo. - In: OPTICS EXPRESS. - ISSN 1094-4087. - 22:21(2014), pp. 26302-26311. [10.1364/OE.22.026302]
Sub-wavelength confinement of the orbital angular momentum of light probed by plasmonic nanorods resonances
GAROLI, DENIS;
2014
Abstract
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.
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