Abstract

The effects of microscopic diffuseness of the boundary surface of metal spheres on the surface plasmons and the optical properties are investigated. It is found that the surface-plasmon frequencies are lower than those of a sphere with a sharp surface. The extinction cross sections of small spheres with diffuse surfaces are calculated, and a corresponding shift of the absorption maxima towards the low-frequency side is found to occur, as well as a broadening of the peaks. The relationship of these calculations to previous optical measurements performed on small metal spheres is discussed.

© 1976 Optical Society of America

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