Production of angular-selective films by interdiffusion for novel spectral responses

A. K. Moazzem M. Hossain; Geoffrey B. Smith

doi:10.1117/12.367564

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11 October 1999 Production of angular-selective films by interdiffusion for novel spectral responses

A. K. Moazzem M. Hossain, Geoffrey B. Smith

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Proceedings Volume 3789, Solar Optical Materials XVI; (1999) https://doi.org/10.1117/12.367564
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

Aluminum is a good candidate for both solar and visible angular selectivity if used in metal/high refractive index insulator combinations, but angular selectivity was not observed in Al/TiO₂ films prepared in traditional co- deposition techniques. A new approach, deposition of a thin oblique Al layer, then oblique TiO₂, and later annealing in vacuum, was attempted and good angular selectivity observed in this material combination. In contrast to other angular selective films, these films showed angular selectivity in s-polarized light for the plane of incidence parallel to the TiO₂ columns. Spectral transmittance plots show the effects of Al content and annealing temperature of angular selectivity. SEM micrographs confirm the oblique columnar structure of the annealed complex, and inter-diffusion of Al through the TiO₂ columns.

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A. K. Moazzem M. Hossain and Geoffrey B. Smith "Production of angular-selective films by interdiffusion for novel spectral responses", Proc. SPIE 3789, Solar Optical Materials XVI, (11 October 1999); https://doi.org/10.1117/12.367564

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