Abstract
High amount of gold nanoparticles was successfully incorporated into amorphous BaTiO3 thin films by sol-gel process. Thiourea was applied to prevent Au ions from being reduced and aggregating as the effective stabilization agents. These films exhibited unique surface plasma resonance red-shifting and particular changes of surface plasma resonance intensity with the increase of heat-treating temperature, which could be attributed to the influence of BaTiO3 ferroelectric domains. The films also exhibited superfast nonlinear optical response and larger third-order nonlinear susceptibility χ(3), which was attributed to hot electron contribution.
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