A theoretical model is presented that describes the volume scattering in thin optical films, particularly in typical columnar structures. It is based on a first-order perturbation theory that concerns the fluctuation of the dielectric permittivity in the film. For evaporated PbF2 films that show a pronounced columnar morphology, angular as well as total integrated scattering measurements at λ = 633 nm have been performed on a special layer design to suppress roughness-induced scattering. A comparison of the predicted theoretical and the measured experimental values leads to such structural parameters as packing density and the evolutionary exponent of the columns.
© 1992 Optical Society of America
Original Manuscript: June 26, 1990
Published: March 20, 1992
Samer Kassam, Angela Duparré, Karl Hehl, Peter Bussemer, and Jakob Neubert, "Light scattering from the volume of optical thin films: theory and experiment," Appl. Opt. 31, 1304-1313 (1992)