Optical constants of TiO1.7 thin films deposited by electron beam gun

Electron beam evaporation technique was used to prepare TiO1.7 thin films onto glass substrates of thicknesses 50, 500 and 1000 nm for each sample. Transmittance measurements in the wavelength range (350-2000 nm) were used to calculate the refractive index n and the absorption index k using Swanepole's method. The optical band gap Egopt determined by three different methods and the values obtained were in the same harmony. Optical conductivity σopt, complex dielectric constant, relaxation time τ and dissipation factor tan δ were determined. The analysis of the optical absorption data indicates that the optical band gap Egoptwas indirect transitions. According to Wemple and Didomenico method, the optical dispersion parameters Eo and Ed were determined.