Nonlinear absorption and nonlinear refraction in single-phased Ti1-xInxO2 (x=0～0.1) thin films

作者：Niu, Ruifeng; Cui, Liqi; Wang, Weitian^*

来源：Journal of the Optical Society of America B-Optical Physics, 2022, 39(9): 2329-2334.

DOI：10.1364/JOSAB.463483

• 3RD-ORDER OPTICAL NONLINEARITY
• DOPED TIO2

In this study, single-phased rutile Ti1-xInxO2 (x = 0 similar to 0.1) thin films were deposited on fused quartz substrates using a pulsed laser deposition technique. The transmission spectra reveal that the films show good transparency in the wavelength range of 330-900 nm. The absorption edge of the Ti1-xInxO2 thin films is blueshifted compared with that of undoped TiO2 films. A single-beam z-scan method using a pulse laser operating at 532 nm with a duration of 55 ps was employed to evaluate the films' nonlinear optical characteristics. The results show that the prepared Ti1-xInxO2 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 Ti1-xInxO2 film obviously increases with the increasing doping of In ions. The local electron-pinned defect-dipoles and widening bandgaps in the Ti1-xInxO2 thin films could be used to explain the observed results.

• 单位
  烟台大学