Vol. 6, issue 11, article # 13

Abstract:

We present some results of theoretical and experimental studies of light absorption by random fractal clusters of quasispherical silver particles 5 nm in radius. Aggregation of particles in clusters is found to be accompanied by the appearance of a long—wave wing in the absorption spectra, while the absorption at the frequency corresponding to absorption by a monomer decreases. The results of calculation of the wing shape by a technique of bonded dipoles describe fairly well the experimental data. The absorption band broadening is nonuniform, what is well confirmed by the experiments on burning out of spectral and polarization—selective dips in the absorption spectra of clusters.