Abstract
We have measured the third-order nonlinear susceptibilities χ(3) of SnO2 nanoparticles both naked and coated with a layer of stearic acid by using Z-scan technique with 1.06 μm pulse from a Q-switched Nd:YAG laser. The results show that the χ(3) of these nanoparticles is much larger than that of the bulk material. Moreover, we find that two-photon absorption is not present for the naked nanoparticles but it is present for the coated ones, and the χ(3) of the latter is larger than that of the former. It is demonstrated that the surface situations of the nanoparticles have great influence on their nonlinear optical properties.
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