ENTROPY APPLIED TO MORPHOLOGICAL ANALYSIS AND MODELIZATION OF NANOMATERIAL OPTICAL-PROPERTIES

The normalized configuration entropy, based on the theory of informati on, when applied to the image of heterogeneous media, points out a cha racteristic length of the disorder, l(opt), at which we calculate the optical properties. The models we propose make a partition of the imag e between percolated and non percolated cells of size l(opt), in which we calculate effective dielectric functions. Two models are then deve loped performing respectively a coherent and a non coherent treatment in the calculation of the optical properties of the whole medium. The coherent model gives a good account of the metallic grain resonance an d of the infrared behavior of both reflectance and transmittance of gr anular gold films, close to the percolation threshold, domain where th e effective medium theories fail.