The effects of the local dielectric environment of the surface-plasmon resonances of annealed gold-island films are studied experimentally and modeled theoretically. Gold-island films were annealed at 600degC to produce spherodial shape particles which exhibit will-resolved resonances in polarized, angle-resolved, absorption spectra. These resonances are shifted in different amounts by the deposlarization effect of the surrounding medium (liquids with various refraction indices). Cross-section claculations based upon non-retarded, single-particle, dielectric interaction for these various configurations are presented and found to be in good agreement with the experimental observations.
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