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

Electron beam evaporation technique was used to prepare TiO_1.7 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 determined by three different methods and the values obtained were in the same harmony. Optical conductivity σ_opt, 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 was indirect transitions. According to Wemple and Didomenico method, the optical dispersion parameters E_o and E_d were determined.