Optical properties of pulsed laser deposited rutile titanium dioxide films on quartz substrates determined by Raman scattering and transmittance spectra

Hu, Z. G.; Li, W. W.; Wu, J. D.; Sun, J.; Shu, Q. W.; Zhong, X. X.; Zhu, Z. Q.; Chu, J. H.
November 2008
Applied Physics Letters;11/3/2008, Vol. 93 Issue 18, p181910
Academic Journal
Optical response of rutile TiO2 films grown under different laser energy by pulsed laser deposition has been investigated by Raman scattering and spectral transmittance. Dielectric functions in the photon energy range of 1.24–6.5 eV have been extracted by fitting the experimental data with the Adachi’s model [S. Adachi, Phys. Rev. B 35, 7454 (1987)]. The refractive index dispersion in the transparent region is mainly ascribed to the higher A1-A2 electronic transitions for the rutile TiO2 films. Owing to slightly different crystalline structures and film densities, the optical band gap linearly increases with increasing packing density. The phenomena were confirmed by different theoretical evaluation methods.


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