Exciting surface plasmons with transformation media
Abstract
We present a way of exciting surface plasmon polaritons along non-patterned metallic surfaces by means of a flat squeezing slab designed with transformation optics. The slab changes the dispersion relation of incident light, enabling evanescent coupling to propagating surface plasmons. Unlike prism couplers, the proposed device does not introduce reflections at its input interface. Moreover, its compact geometry is suitable for integration. A feasible dielectric implementation of the coupler is suggested. Finally, we show that the angular response of the device can be engineered by using a non-uniform compression factor. As an example, we design a coupler with a half-power angular bandwidth 2.5 times higher than that of a conventional dielectric coupler.
Cite
@article{arxiv.1410.6034,
title = {Exciting surface plasmons with transformation media},
author = {Carlos García-Meca and Rubén Ortuño and Javier Martí and Alejandro Martínez},
journal= {arXiv preprint arXiv:1410.6034},
year = {2014}
}
Comments
11 pages, 6 figures