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We report on measurements of visible extinction spectra of semicontinuoussilver nanoshells grown on colloidal silica spheres. We find that thin, fractalshells below the percolation threshold exhibit geometrically tunable plasmonresonances. A modified scaling theory approach is used to model the dielectricresponse of such shells, which is then utilized to obtain the extinction crosssection in a retarded Mie scattering formalism. We show that such sphericalresonators support unique plasmon dynamics: in the visible there is a newregime of coherently driven cluster-localized plasmons, while crossover tohomogeneous response in the infrared predicts a delocalized shell plasmon.Comment: 5 pages, 4 figures : Accepted for publication, PRL, Feb 6 2003.  Additional changes after final revie

Coherent Light Scattering from Semicontinuous Silver Nanoshells near the Percolation Threshold