Breaking the Mode Degeneracy of Surface-Plasmon Resonances in a Triangular System
Abstract
In this paper, we present a systematic investigation of symmetry-breaking in the plasmonic modes of triangular gold nanoprisms. Their geometrical C3 symmetry is one of the simplest possible that allows degeneracy in the particle's mode spectrum. It is reduced to the non-degenerate symmetries Cv or E by positioning additional, smaller gold nanoprisms in close proximity, either in a lateral or a vertical configuration. Corresponding to the lower symmetry of the system, its eigenmodes also feature lower symmetries (Cv), or preserve only the identity (E) as symmetry. We discuss how breaking the symmetry of the plasmonic system not only breaks the degeneracy of some lower order modes, but also how it alters the damping and eigenenergies of the observed Fano-type resonances.
Keywords
Cite
@article{arxiv.1202.5876,
title = {Breaking the Mode Degeneracy of Surface-Plasmon Resonances in a Triangular System},
author = {Nahid Talebi and Wilfried Sigle and Ralf Vogelgesang and Christoph T. Koch and Cristina Fernandez-Lopez and Luis M. Liz-Marzan and Burcu Ogut and Melanie Rohm and Peter A. van Aken},
journal= {arXiv preprint arXiv:1202.5876},
year = {2012}
}