Abstract
Single-phased rutile TiO2 and Ti0.9In0.1O2 thin films were fabricated using a pulsed laser deposition method. The optical transmission spectra reveal good transparency of the films in the visible spectral range of 330–900 nm. The absorption edge of the Ti0.9In0.1O2 film is blue-shifted compared with that of undoped TiO2 film. The third-order nonlinear optical properties of the films were investigated using a z-scan method with a pulse laser operating at 532 nm with pulse duration of 55 ps. The results show that the Ti0.9In0.1O2 and TiO2 films exhibit nonlinear saturable absorption and negative nonlinear refraction properties. The doping of In ions into TiO2 does not change the nonlinear optical absorption significantly. However, the nonlinear refractive index of Ti0.9In0.1O2 film is about two times larger than that of undoped TiO2 film. The local electron-pinned defect-dipoles and widening bandgap in the Ti0.9In0.1O2 film could be used to explain the observed results.
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Niu, R., Cui, L. & Wang, W. Nonlinear optical properties of indium-doped single-phased TiO2 thin films. J. Korean Phys. Soc. 81, 311–316 (2022). https://doi.org/10.1007/s40042-022-00519-6
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DOI: https://doi.org/10.1007/s40042-022-00519-6