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Proceedings Paper

Angular Selective Window Coatings: Theory And Experiment
Author(s): G. Mbise; G. B. Smith; G. A. Niklasson; C. G. Granqvist
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Paper Abstract

Surface coatings with strongly angular-dependent transmittance are explored theoretically and experimentally. Theoretical studies are reported for multilayer coatings with more than one uniform metal film and for single-layer coatings with oblique columnar microstructure. The latter coatings are represented by effective medium theories encompassing prolate spheroidal structure elements. Amplitude coefficients for transmission and reflection are derived for the plane spanned by the column axis and the surface normal in uniaxial materials; these coefficients are extensions of well-known Fresnel relations. The transmittance of p-polarized light is angular selective, i.e. is unsymmetric around the surface normal, for absorbing columns. An experimental study of obliquely evaporated metal films showed that well defined inclined columns could be observed in scanning electron micrographs of fractured Cr films, and that the optical properties of such films displayed angular selectivity in qualitative agreement with theory.

Paper Details

Date Published: 12 December 1989
PDF: 21 pages
Proc. SPIE 1149, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VIII, (12 December 1989); doi: 10.1117/12.962181
Show Author Affiliations
G. Mbise, University of Dar es Salaam (Tanzania, United Republic of)
G. B. Smith, School of Physics and Materials, University of Technology (Australia)
G. A. Niklasson, Chalmers University of Technology and University of Gothenburg (Sweden)
C. G. Granqvist, Chalmers University of technology and University of Gothenburg (Sweden)

Published in SPIE Proceedings Vol. 1149:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VIII
Claes-Goeran Granqvist; Carl M. Lampert, Editor(s)

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