a Institute of Modern Optics, Nankai University, Tianjin 300071, China; b Xi'an Institute of Optics and fine Mechanics, Academia Sinica, Xi'an 710068, China
Abstract We have measured the third-order nonlinear susceptibilities $\chi$(3) of SnO2 nanoparticles both naked and coated with a layer of stearic acid by using Z-scan technique with 1.06μm pulse from a Q-switched Nd:YAG laser. The results show that the $\chi$(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 preseut for the coated ones, and the $\chi$(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.
Received: 09 December 1994
Revised: 25 September 1995
Accepted manuscript online:
Fund: Project supported by the Climbing Programme-Chinese Nationed Key Project for Fundamental Research and State Key Laboratory of Transient Optical Technique. Xi'an Institute of Optics and Fine Mechanics, Academia Sinica, China.
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