Abstract
A strong resonant absorption near 400 nm is found when minute quantities of WO3 are deposited on Ag surfaces. In order to explain this behavior, a granular structure is assumed for the WO3 overcoat on the metallic substrate. This phenomenon could arise from the coupling of light with surface plasma waves via the mirror-image effect. The WO3 material by itself shows nonabsorptive behavior in the spectral region considered. Experimental evidence is provided by differential reflectance measurements from 350 to 1000 nm for WO3 overcoats with a mass thickness varying from 1.5 to 15 nm. A well-defined peak in the magnitude of the differential reflectance is found, shifting from 390 to 410 nm with increasing overcoat thickness. The observed behavior is consistent with predictions by an effective-medium theory for the granular WO3 deposit, which takes into account the dipole–dipole interactions between particles and the mirror-image effect in the metallic substrate.
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