Abstract

We present a strategy, based on a Fresnel coefficient pole analysis, for designing an asymmetric multilayer structure that supports long-range surface plasmons (LRSPs). We show that the electric field intensity in the metal layer of the multilayer structure can be reduced significantly, resulting in small absorption losses and LRSP propagation lengths up to 2 mm. With a view toward biosensing applications, we also present semi-analytic expressions for a standard surface sensing parameter in arbitrary planar resonant structures and in particular show that for an asymmetric structure consisting of a gold film deposited on a multilayer of ${\mathrm{SiO}}_2$ and ${\mathrm{TiO}}_2$ a surface sensing parameter $G=1.28{\mathrm{nm}}^{-1}$ can be achieved.

© 2015 Optical Society of America

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