Abstract

We propose a refractive index sensor based on the interference of two surface-plasmon waves on both surfaces of a gold film with a two-slit structure. The phase of the interference was solved, and the dispersion relation of the real part of Au dielectric function was considered. The sensor was performed with $\mathrm{Na}\mathrm{Cl}{-\mathrm{H}}_2\mathrm{O}$ solutions of different concentrations and exhibited a linear response and a high sensitivity of $4547\mathrm{nm}∕\mathrm{RIU}$ (refractive index unit) to the refractive index change.

© 2009 Optical Society of America

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