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Optical absorption by clusters of small metallic spheres

1986; American Physical Society; Volume: 33; Issue: 12 Linguagem: Inglês

10.1103/physrevb.33.7956

1095-3795

F. Claro, Ronald Fuchs,

Optical and Acousto-Optic Technologies

An ansatz for the distribution of depolarization factors, based on a theory of the optical response of nearly touching spheres, is used to calculate the optical absorption of a medium containing isolated clusters of small metallic spheres. The calculated absorption agrees qualitatively with experiments over the entire frequency range. In the far-infrared region we find enhanced absorption and predict a small deviation from an ${\ensuremath{\omega}}^{2}$ frequency dependence.