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A Sign Alternation of Nonlinear Absorption in Gold Composite Films in Z-Scan |
CHEN Dai-Jian1;DING Sha1;HAN Jun-Bo1;ZHOU Hui-Jun1;XIAO Si1;XIONG Gui-Guang1;WANG Qu-Quan1,2 |
1Department of Physics, Wuhan University, Wuhan 430072
2Center of Nanoscience and Nanotechnology Research, Wuhan University, Wuhan 430072 |
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Cite this article: |
CHEN Dai-Jian, DING Sha, HAN Jun-Bo et al 2005 Chin. Phys. Lett. 22 2286-2289 |
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Abstract Au--TiO2 composite films with Au atom content varying from about 15% to 82% are prepared by co-sputtering technique. Both open- and closed-aperture Z-scan of the samples are performed in the femtosecond time region. A conversion of the nonlinear absorption from negative to positive is observed as the Au atom content increases due to the saturation of reverse saturable absorption. The nonlinear refractive index γ and effective nonlinear absorption coefficient βeff at the Au atom content of 54% are measured to be 1.6×10-2cm2/GW and -2.6×103cm/GW, respectively. The corresponding third-order optical nonlinearity x(3) is about 6.3×10-8esu.
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Keywords:
42.65.An
42.70.Nq
81.15.Cd
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Published: 01 September 2005
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PACS: |
42.65.An
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(Optical susceptibility, hyperpolarizability)
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42.70.Nq
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(Other nonlinear optical materials; photorefractive and semiconductor materials)
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81.15.Cd
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(Deposition by sputtering)
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