Plasmonic modes of extreme subwavelength nanocavities
Abstract
We study the physics of a new type of subwavelength nanocavities. They are based on U-shaped metal-insulator-metal waveguides supporting the excitation of surface plasmon polaritons. The waveguides are simultaneously excited from both sides of the U by incident plane waves. Due to their finite length discrete modes emerge within the nanocavity. We show that the excitation symmetry with respect to the cavity ends permits the observation of even and odd modes. Our investigations include near and far field simulations and predict a strong spectral far field response of the comparable small nanoresonators. The strong near field enhancement observed in the cavity at resonance might be suitable to increase the efficiency of nonlinear optical effects, quantum analogies and might facilitate the development of active optical elements, such as active plasmonic elements.
Keywords
Cite
@article{arxiv.1004.2340,
title = {Plasmonic modes of extreme subwavelength nanocavities},
author = {Joerg Petschulat and Christian Helgert and Michael Steinert and Norbert Bergner and Carsten Rockstuhl and Falk Lederer and Thomas Pertsch and Andreas Tuennermann and Ernst-Bernhard Kley},
journal= {arXiv preprint arXiv:1004.2340},
year = {2016}
}