Abstract
A kind of Au nanoparticle (NP) containing 2D hexagonal mesoporous 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 . The third-order nonlinear optical refractive index of the Au NPs contained MTTFs has been measured by the Z-scan technique at . The absolute value of nonlinear refractive index and third-order nonlinear susceptibility were calculated to be and , 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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