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.

Beaming of Helical Light from Plasmonic Vortices via Adiabatically Tapered Nanotip / Garoli, D; Zilio, P; Gorodetski, Y; Tantussi, F; De Angelis, F. - In: NANO LETTERS. - ISSN 1530-6984. - 16:10(2016), pp. 6636-6643. [10.1021/acs.nanolett.6b03359]

Beaming of Helical Light from Plasmonic Vortices via Adiabatically Tapered Nanotip

Garoli D;
2016

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.
2016
16
10
6636
6643
Beaming of Helical Light from Plasmonic Vortices via Adiabatically Tapered Nanotip / Garoli, D; Zilio, P; Gorodetski, Y; Tantussi, F; De Angelis, F. - In: NANO LETTERS. - ISSN 1530-6984. - 16:10(2016), pp. 6636-6643. [10.1021/acs.nanolett.6b03359]
Garoli, D; Zilio, P; Gorodetski, Y; Tantussi, F; De Angelis, F
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1315977
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