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Unidirectional plasmonic edge modes on general two-dimensional materials

Unidirectional plasmonic edge modes on general two-dimensional materials We investigate the field and spin-momentum coupling of edge plasmons hosted by general two-dimensional materials and identify sweet spots depending on the polarisation plane, ellipticity and the position of an electric dipole relative to the plane and edge. Exciting the dipole at these sweet spots by propagating light leads to uni-directional propagating edge plasmons or edge modes suppression. We also extend previous approximate treatments (Fetter 1985 Phys. Rev. B 32 7676) to include anisotropy and hyperbolic systems, elucidating its predictions for the existence of edge modes. A thorough assessment of the approximate description is carried out, comparing its spin-momentum coupling features in the near field with exact results from Wiener–Hopf techniques. Simulations are also performed confirming the overall picture. Our results shed new light on the quest of chiral plasmonics in 2D materials and should be relevant for future experiments. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png 2D Materials IOP Publishing

Unidirectional plasmonic edge modes on general two-dimensional materials

2D Materials , Volume 6 (4): 12 – Oct 1, 2019

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References (43)

Copyright
Copyright © 2019 IOP Publishing Ltd
eISSN
2053-1583
DOI
10.1088/2053-1583/ab2f05
Publisher site
See Article on Publisher Site

Abstract

We investigate the field and spin-momentum coupling of edge plasmons hosted by general two-dimensional materials and identify sweet spots depending on the polarisation plane, ellipticity and the position of an electric dipole relative to the plane and edge. Exciting the dipole at these sweet spots by propagating light leads to uni-directional propagating edge plasmons or edge modes suppression. We also extend previous approximate treatments (Fetter 1985 Phys. Rev. B 32 7676) to include anisotropy and hyperbolic systems, elucidating its predictions for the existence of edge modes. A thorough assessment of the approximate description is carried out, comparing its spin-momentum coupling features in the near field with exact results from Wiener–Hopf techniques. Simulations are also performed confirming the overall picture. Our results shed new light on the quest of chiral plasmonics in 2D materials and should be relevant for future experiments.

Journal

2D MaterialsIOP Publishing

Published: Oct 1, 2019

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