Size and dielectric dependence of the third-order nonlinear optical response of Au nanocrystals embedded in matrices

The third-order nonlinear optical response of Au nanocrystals embedded in BaTiO(3) and ZrO(2) matrices was investigated through the off-resonance femtosecond optical Kerr effect. Compared with pristine films, the nonlinearity of composite films shows an enhancement that depends on the sizes of Au pa...

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Bibliographic Details
Published in:Optics letters 2002-06, Vol.27 (12), p.1043-1045
Main Authors: Ma, Guohong, Sun, Wanxin, Tang, Sing-Hai, Zhang, Hanzhuang, Shen, Zexiang, Qian, Shixiong
Format: Article
Language:English
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Summary:The third-order nonlinear optical response of Au nanocrystals embedded in BaTiO(3) and ZrO(2) matrices was investigated through the off-resonance femtosecond optical Kerr effect. Compared with pristine films, the nonlinearity of composite films shows an enhancement that depends on the sizes of Au particles and the refractive index of the matrices. We performed a calculation based on Lorenz-Mie scattering theory to explain the experimental results. Additionally, the nonlinearity was optimized by determination of the values of the particle size and the refractive index of the matrix.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.27.001043