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Beaming of Helical Light from Plasmonic Vortices via Adiabatically Tapered Nanotip.

ABSTRACT: We demonstrate the generation of far-field propagating optical beams with a desired orbital angular momentum by using a smooth optical-mode transformation between a plasmonic vortex and free-space Laguerre-Gaussian modes. This is obtained by means of an adiabatically tapered gold tip surrounded by a spiral slit. The proposed physical model, backed up by the numerical study, brings about an optimized structure that is fabricated by using a highly reproducible secondary electron lithography technique. Optical measurements of the structure excellently agree with the theoretically predicted far-field distributions. This architecture provides a unique platform for a localized excitation of plasmonic vortices followed by its beaming.

SUBMITTER: Garoli D

PROVIDER: S-EPMC6660026 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature

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Beaming of Helical Light from Plasmonic Vortices via Adiabatically Tapered Nanotip.

Garoli Denis D Zilio Pierfrancesco P Gorodetski Yuri Y Tantussi Francesco F De Angelis Francesco F

Nano letters 20160914 10

We demonstrate the generation of far-field propagating optical beams with a desired orbital angular momentum by using a smooth optical-mode transformation between a plasmonic vortex and free-space Laguerre-Gaussian modes. This is obtained by means of an adiabatically tapered gold tip surrounded by a spiral slit. The proposed physical model, backed up by the numerical study, brings about an optimized structure that is fabricated by using a highly reproducible secondary electron lithography techni ...[more]

PMID: 27618524

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