ISSN 1002-1027  CN 11-2952/G2

Acta scientiarum naturalium Universitatis Pekinensis

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Large Third-Order Optical Nonlinearity of SnO2/PVA Composite Thin Film Measured by Femtosecond Optical Kerr Effect Method

LIANG Ruisheng1, GONG Qihuang2, WANG Shufeng2, HUANG Wentao2, WANG Dehuang2, CHENG Humin3, MA Jiming3   

  1. 1School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou, 510631; 2National Laboratory for Mesoscopic Physics and Physics School, Peking University, Beijing, 100871; 3Col
  • Received:2002-05-25 Online:2003-05-20 Published:2003-05-20

Abstract: The third-order nonlinear susceptibility χ(3) of SnO2/PVA composite thin film was measured by a femtosecond time-resolved optical Kerr effect OKE at 810nm wavelength. The χ(3) observed was 4.301×10-14esu for SnO2 nanoparticles which average diameter is 10nm and 1.728×10-13esu for 2~3nm SnO2 nanoparticles. Femtosecond time-resolved OKE measurements revealed that the response time of the optical nonlinearity in SnO2/PVA thin film is extremely fast as short as 50fs.