Dielectric media with inclusions of small metallic particles which are simple models for inhomogeneous material, were investigated both experimentally and theoretically to analyze the influences of the topographical arrangement of the particles on the optical properties of the samples. If coagulation aggregates are formed, power laws describe the aggregate size distribution and the aggregate compactness, yet with exponents varying from sample to sample. The optical properties are composed of contributions of the individual particles and of collective effects. These contribution are allotted according to the structure of the effective local electromagnetic field into effective medium effects and van der Waals coupling effects. Numerical and experimental results are presented for special systems of noble particles. They show strong influences of the topographical details in special for the IR spectral region.
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Kreibig et al. (1986) studied this question.
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