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Helicity locking of chiral light emitted from a plasmonic nanotaper

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Abstract

Surface plasmon waves carry an intrinsic transverse spin, which is locked to its propagation direction. Apparently, when a singular plasmonic mode is guided on a conic surface this spin-locking may lead to a strong circular polarization of the far-field emission. Specifically, a plasmonic vortex excited on a flat metal surface propagates on an adiabatically tapered gold nanocone where the mode accelerates and finally beams out from the tip apex. The helicity of this beam is shown to be single-handed and stems solely from the transverse spin-locking of the helical plasmonic wave-front. We present a simple geometric model that fully predicts the emerging light spin in our system. Finally, we experimentally demonstrate the helicity-locking phenomenon by using accurately fabricated nanostructures and confirm the results with the model and numerical data.

Graphical abstract: Helicity locking of chiral light emitted from a plasmonic nanotaper

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Publication details

The article was received on 08 Mar 2017, accepted on 18 Apr 2017 and first published on 20 Apr 2017


Article type: Communication
DOI: 10.1039/C7NR01674C
Citation: Nanoscale, 2017, Advance Article
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    Helicity locking of chiral light emitted from a plasmonic nanotaper

    D. Garoli, P. Zilio, F. De Angelis and Y. Gorodetski, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR01674C

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