Abstract
In this study, properties of long-range surface plasmons (LRSPs) in an arbitrary multilayer structure have been investigated. We derived an approximation of the reflectivity from Fresnel formulas. Furthermore, the resonant properties of LRSPs have been calculated. As a result of the simulations, we conclude that the difference in resonant angles decreases as the metal thickness increases, and the damping rate obtained from the Sarid geometry is lower than that obtained from the Kretschmann geometry. The resonant half-width obtained from the Sarid geometry is narrower than those obtained from the Kretschmann and Otto geometries. As far as SP chemical sensors are concerned, the system based on the Sarid geometry is better than that based on the Kretschmann or Otto geometry.
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