In this manuscript we report on a near-feld study of two-dimensional plasmonic gold nano-wedges using electron energy loss spectroscopy in combination with scanning transmission electron microscopy, as well as discontinuous Galerkin time-domain computations. With increasing nano-wedge size, we observe a transition from localized surface plasmons on small nano-wedges to non-resonant propagating surface plasmon polaritons on large nano-wedges. Furthermore we demonstrate that nano-wedges with a groove cut can support localized as well as propagating plasmons in the same energy range.
@article{arxiv.1703.09291,
title = {A near-field study on the transition from localized to propagating plasmons on 2D nano-wedges},
author = {Thorsten Weber and Thomas Kiel and Stephan Irsen and Kurt Busch and Stefan Linden},
journal= {arXiv preprint arXiv:1703.09291},
year = {2017}
}