Abstract

A kind of Au nanoparticle (NP) containing 2D hexagonal mesoporous TiO2 thin films (MTTFs) has been successfully synthesized through a deposition–precipitation method. The Au NPs show uniform size distribution and the Au content within the MTTFs is measured to be 7.49wt.%. The third-order nonlinear optical refractive index of the Au NPs contained MTTFs has been measured by the Z-scan technique at 1064nm. The absolute value of nonlinear refractive index (n2) and third-order nonlinear susceptibility (χ(3)) were calculated to be 2.64×107 and 6.32×108esu, respectively. The high nonlinearity of the composite thin films can be attributed to the intraband transition of electrons near the Fermi surface in well-dispersed Au NPs confined in mesoporous channels and the high linear refractive index of the nanocrystalline anatase framework.

© 2008 Optical Society of America

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