Intensity and composition-dependent sign reversal of non-linearity in TiO2/CeO2 nanocomposites

doi:10.1088/1674-1056/23/3/034209

Abstract CeO₂/TiO₂ composite nanoparticles with different Ce/Ti molar ratios have been successfully synthesized via sol–gel method. It was found that the band gap of the nanocomposite is tunable by varying Ce/Ti content. The nonlinear response of the sample was studied by using the nanosecond laser pulses from a Q switched Nd:Yag laser employing the Z-scan method. Open aperture Z-scan experiment revealed that with the increase in the CeO₂ amount in the nanocomposite, the non-linearity of the composite increases, and it was assumed that this could be due to the modification of TiO₂ dipole symmetry by the addition of CeO₂. Closed aperture Z-scan experiment showed that when the CeO₂ amount increases, positive nonlinear refraction decreases, and this could be attributed to the increase in the two photon absorption which subsequently suppresses the nonlinear refraction.

Keywords: sol–gel method non-linearity Z-scan experiment reversesaturation absorption curve

Received: 19 June 2013
Revised: 25 July 2013
Accepted manuscript online:

PACS:	42.65.-k	(Nonlinear optics)
	42.70.Nq	(Other nonlinear optical materials; photorefractive and semiconductor materials)

Fund: Project supported by the Department of Science and Technology (DST), Govt. of India.

Corresponding Authors: S. Divya
E-mail: divyasasi7@gmail.com

Cite this article:

S. Divya, V. P. N. Nampoori, P. Radhakrishnan, A. Mujeeb Intensity and composition-dependent sign reversal of non-linearity in TiO₂/CeO₂ nanocomposites 2014 Chin. Phys. B 23 034209

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Intensity and composition-dependent sign reversal of non-linearity in TiO2/CeO2 nanocomposites

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Intensity and composition-dependent sign reversal of non-linearity in TiO₂/CeO₂ nanocomposites