Surface plasmons in layered structures with semiconductor and metallic films

Issue		Eur. Phys. J. Appl. Phys. Volume 46, Number 3, June 2009 Metamaterials


Article Number		32605
Number of page(s)		13
Section		Metamaterials 2007
DOI		10.1051/epjap/2009021
Published online		17 March 2009

Eur. Phys. J. Appl. Phys. 46, 32605 (2009)
DOI: 10.1051/epjap/2009021

Surface plasmons in layered structures with semiconductor and metallic films

A.G. Schuchinsky and X. Yan

Queen's University Belfast, Belfast, BT3 9DT, UK

a.schuchinsky@qub.ac.uk

Received: 18 April 2008 / Received in final form: 10 December 2008 / Accepted: 12 December 2008 / Published online: 17 March 2009

Abstract
The complete spectrum of eigenwaves including surface plasmon polaritons (SPP), dynamic (bulk) and complex waves in the layered structures containing semiconductor and metallic films has been explored. The effects of loss, geometry and the parameters of dielectric layers on the eigenmode spectrum and, particularly, on the SPP modes have been analysed using both the asymptotic and rigorous numerical solutions of the full-wave dispersion equation. The field and Poynting vector distributions have been examined to identify the modes and elucidate their properties. It has been shown that losses and dispersion of permittivity qualitatively alter the spectral content and the eigenwave properties. The SPP counter-directional power fluxes in the film and surrounding dielectrics have been attributed to vortices of power flow, which are responsible for the distinctive features of SPP modes. It has been demonstrated for the first time that the maximal attainable slow-wave factor of the SPP modes guided by thin Au films at optical frequencies is capped not by losses but the frequency dispersion of the actual Au permittivity.

PACS
42.25.Bs - Wave propagation, transmission and absorption.
78.20.Bh - Theory, models, and numerical simulation.
73.20.Mf - Collective excitations (including excitons, polarons, plasmons and other charge-density, excitations).

© EDP Sciences 2009

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