| A Sign Alternation of Nonlinear Absorption in Gold Composite Films in Z-Scan |
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| 作者姓名： | 陈代坚 丁沙 韩俊波 周慧君 肖思 熊贵光 王取泉 |
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| 作者单位： | [1]Department of Physics, Wuhan University, Wuhan 430072 [2]Center of Nanoscience and Nanotechnology Research, Wuhan University, Wuhan 430072 |
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| 摘 要： | 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 A u 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^-2 cm^2/GW and -2.6 ×10^3 cm/GW, respectively. The corresponding third-order optical nonlinearity X^（3） is about 6.3 × 10^-8 esu.
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| 关 键 词： | Au-TiO2复合膜 金原子 电子散射 Z扫描 非线性吸收 |
| 收稿时间： | 2005-03-09 |
| 修稿时间： | 2005-03-09 |
A Sign Alternation of Nonlinear Absorption in Gold Composite Films in Z-Scan |
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| Chen DaiJian;Ding Sha;Han JunBo;Zhou HuiJun;Xiao Sai;Xiong GuiGuang;Wang QuQuan.A Sign Alternation of Nonlinear Absorption in Gold Composite Films in Z-Scan[J].Chinese Physics Letters,2005,22(9):2286-2289. |
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| Authors: | Chen DaiJian;Ding Sha;Han JunBo;Zhou HuiJun;Xiao Sai;Xiong GuiGuang;Wang QuQuan |
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