EFFECTIVE MEDIUM THEORY OF MULTIPHASE MIXTURE AND SELECTIVE ABSORPTION OF ELECTROLYTICALLY COLORED ANODIC ALUMINUM OXIDE

The effective medium theory is extended to multiphase mixture, and a corresponding formula of effective complex dielectric permittivity is derived. An electrolytically colored anodic aluminum oxide is regarded as a multilayer absorption composite, and the reflectances of Au-Cu-A1₂O₃ and Ag-Cu- A1₂O₃ coatings have been measured.