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a-Si 1-x C x :H thin films doped with different concentrations of Tb have been deposited by magnetron co-sputtering. The carbon content in the films is varied in order to change the optical gap. RBS analysis shows that Tb is homogeneously distributed in the bulk. Optical absorption spectra in the visible are studied and changes in the optical gap and the defect absorption...
Spectra of optical extinction in the visible range for SiO 2 :Ag colloid films prepared by ion implantation and ion beam mixing are compared to calculations for isolated clusters and for interacting clusters in an effective medium. Whereas for low metal concentrations the shape of the spectra is determined by the cluster size, at higher concentrations it largely depends on their mutual interaction...
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