Sur une interprétation des propriétés optiques anormales des couches metalliques minces.

Some thin metallic films show anomalous optical properties, namely, that both energetic position and magnitude of the absorption bands depend on the film thickness. An interpretation, usually accepted, is based on a direct excitation of surface plasmons by means of the granular structure or the roughnesses of the films. The existence of these anomalous bands are explained, independently of the surface irregularities, if we assume a localized absorption.