Ultrafast optical nonlinearity in poly„methylmethacrylate...-TiO2 nanocomposites
نویسندگان
چکیده
With 780-nm, 250-fs laser pulses, ultrafast optical nonlinearity has been observed in a series of thin films containing poly~methyl methacrylate! (PMMA)-TiO2 nanocomposites, which are synthesized by a simple technique of in-situ sol-gel/polymerization. The best figures of merit are found in one of the films prepared with a 60 wt % of titanium isopropoxide. Transmission electron microscopy shows the presence of 5-nm-diameter particles in the film. The observed optical nonlinearity has a recovery time of ;1.5 ps. These findings suggest the strong potential of PMMA-TiO2 nanocomposites for all-optical switching. © 2003 American Institute of Physics. @DOI: 10.1063/1.1568544#
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