2-STEP EFFECTIVE-MEDIUM THEORY AND ITS APPLICATION IN PREDICTING THE OPTICAL-PROPERTIES OF ANODIZED ALUMINA FILM

We propose a two-step effective medium theory to predict the optical p roperties of anodized alumina films based on the assumption that spher ical aluminum particles are distributed in columnar structures within an anodized alumina film (distributed metallic column model). Using th is model, theoretical parameters such as the volume ratio and distribu tion range of alumina particles were determined by fitting the experim ental values and their dependencies on the anodization condition were evaluated. Using the above results, the optical constants of the alumi na films were calculated. (C) 1998 Scripta Technica, Electron Comm Jpn Pt 2, 81(3): 23-28, 1998.