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Proceedings Paper

Efficient OAM generation at the nanoscale level by means of plasmonic vortex lens
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Paper 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 efficiency in each case as well as the intriguing spin-locking phenomenon occurring in our system. Finally we experimentally demonstrate the efficient beaming of a single-handed mode decorated by a desired orbital angular using accurately fabricated nanostructures.

Paper Details

Date Published: 25 August 2017
PDF: 8 pages
Proc. SPIE 10346, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV, 1034634 (25 August 2017); doi: 10.1117/12.2274748
Show Author Affiliations
Yuri Gorodetski, Ariel Univ. (Israel)
Pierfrancesco Zilio, Istituto Italiano di Tecnologia (Italy)
Paolo Ponzellini, Istituto Italiano di Tecnologia (Italy)
Matteo Ardini, Istituto Italiano di Tecnologia (Italy)
Xavier Zambrana-Puyalto, Istituto Italiano di Tecnologia (Italy)
Andrea Jacassi, Istituto Italiano di Tecnologia (Italy)
Eugenio Calandrini, Istituto Italiano di Tecnologia (Italy)
Denis Garoli, Istituto Italiano di Tecnologia (Italy)


Published in SPIE Proceedings Vol. 10346:
Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV
Din Ping Tsai; Takuo Tanaka, Editor(s)

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