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Proceedings Paper

Graded Infinitesimal-Lamellae Model Compared To Data On Graded-Cermet Selective Absorbers
Author(s): Alan S. Penfold
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Paper 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.

Paper Details

Date Published: 1 December 1983
PDF: 8 pages
Proc. SPIE 0428, Optical Materials and Process Technology for Energy Efficiency and Solar Applications, (1 December 1983); doi: 10.1117/12.936314
Show Author Affiliations
Alan S. Penfold, A Dart & Kraft Company (United States)

Published in SPIE Proceedings Vol. 0428:
Optical Materials and Process Technology for Energy Efficiency and Solar Applications
Carl M. Lampert, Editor(s)

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