Abstract
The optical properties of nanostructured titanium and titanium oxide films grown on transparent substrates have been investigated. Titanium films were produced either by cluster deposition or by atom deposition, and subsequently the films were oxidised by controlled exposure to oxygen. Optical extinction spectra in the ultraviolet and visible were recorded during film growth and oxidation. Before oxidation the extinction showed the characteristics of metallic titanium, with the spectrum of the cluster-based film indicating a structure of small spherical particles. After oxidation a band gap opened up and the films became transparent in the visible, and peaks appeared in the spectrum of the sample grown by atom deposition.
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