Graded Infinitesimal-Lamellae Model Compared To Data On Graded-Cermet Selective Absorbers

Alan S. Penfold

doi:10.1117/12.936314

1 December 1983 Graded Infinitesimal-Lamellae Model Compared To Data On Graded-Cermet Selective Absorbers

Alan S. Penfold

Proceedings Volume 0428, Optical Materials and Process Technology for Energy Efficiency and Solar Applications; (1983) https://doi.org/10.1117/12.936314
Event: 27th Annual Technical Symposium, 1983, San Diego, United States

Abstract

An optical laminar composite is defined and a method for calculating its complex index of refraction is determined. This type of composite, along with composites of the mosaic type (Bruggeman composites) and the included-grain type (Maxwell Garnett composites), are then used to model the optical properties of graded cermets (metal/insulator composites) of platinum/alumina. The results of the modelling are compared to recent experimental data obtained in a selective absorber study, where the graded cermets were produced by alternating sputter-deposition of platinum and alumina. The comparison suggests that the intrinsic structural nature of the sputtered cermets cannot be described by a single com-posite model. The intrinsic structure appears to depend on position within the coating; that is, on proximity to the underlying substrate.

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Alan S. Penfold "Graded Infinitesimal-Lamellae Model Compared To Data On Graded-Cermet Selective Absorbers", Proc. SPIE 0428, Optical Materials and Process Technology for Energy Efficiency and Solar Applications, (1 December 1983); https://doi.org/10.1117/12.936314

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