The requirements for reliability of the parameters deduced from the statistical analysis of the cluster morphology of thin inhomogeneous films near the percolation threshold are first pointed out. Two experimental examples of non-relevance in the treatment of films very close to the percolation...

A rigorous connection is established between the local porosity entropy introduced by Boger et al. (Physica A 187 (1992) 55) and the configurational entropy of Andraud et al. (Physica A 207 (1994) 208). These entropies were introduced as morphological descriptors derived from local volume...

When the random morphology of ramified or percolating clusters exhibit local fluctuations, the framework of the theory of random percolation with its critical exponents and fractal dimension is still not enough to describe the disorder and the optical properties. We propose an alternative...

Optical photometric measurements in the visible range (1.4–5.4 eV) under oblique incidence have been performed on Ag/SiO2 periodic multilayers prepared by magnetron sputtering. The results are discussed in terms of radiative virtual modes due to the Ag layers. The fundamental radiative mode is...

We have developed two models for the optical properties of heterogeneous media, based on the entropic analysis of their morphology. These models have been applied to actual granular metallic media close to the percolation. The models account well for the measured optical properties: the plasmon...

We report on electrical resistivity versus temperature from 50 K down to 1.5 K of PtAl2O3 and AuAl2O3 cermets. When the metal volume fraction q is below the percolation threshold qc, the dc conductivity shows a temperature dependence of the form ln σ ∝ T−n which is usually related to...

Optical and electrical properties of inhomogeneous media, strongly depend on the percolating properties of one of the component. In many cases, inhomogeneous media present fractal structures near and at the percolation threshold, and in general, transport properties exhibit a very special...

The optical and electrical properties of metal-dielectric composites (cermets) show large variations as a function of volume fraction, size, shape and the statistical distribution of metallic grains in the dielectric. The flexibility of the optical properties around the percolation threshold can...

We compare the theoretical calculation of the dielectric function ϵ given by the Bruggeman theory, and the experimental values obtained from the reflectance and the transmittance measured by spectrophotometry in the infrared range (1–50 μm). It is concluded that the diluted regimes are well...