Efficient OAM generation at the nanoscale level by means of plasmonic vortex lens

Yuri Gorodetski; Pierfrancesco Zilio; Paolo Ponzellini; Matteo Ardini; Xavier Zambrana-Puyalto; Andrea Jacassi; Eugenio Calandrini; Denis Garoli

doi:10.1117/12.2274748

25 August 2017 Efficient OAM generation at the nanoscale level by means of plasmonic vortex lens

Yuri Gorodetski, Pierfrancesco Zilio, Paolo Ponzellini, Matteo Ardini, Xavier Zambrana-Puyalto, Andrea Jacassi, Eugenio Calandrini, Denis Garoli

Author Affiliations +

Proceedings Volume 10346, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV; 1034634 (2017) https://doi.org/10.1117/12.2274748
Event: SPIE Nanoscience + Engineering, 2017, San Diego, California, United States

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.

Citation Download Citation

Yuri Gorodetski, Pierfrancesco Zilio, Paolo Ponzellini, Matteo Ardini, Xavier Zambrana-Puyalto, Andrea Jacassi, Eugenio Calandrini, and Denis Garoli "Efficient OAM generation at the nanoscale level by means of plasmonic vortex lens", Proc. SPIE 10346, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV, 1034634 (25 August 2017); https://doi.org/10.1117/12.2274748

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