| Wavelength-dependent nonlinear absorption of gold nanocages |
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| 作者姓名： | 陈爽 杨素英 黄妍 焦威严 范光华 高亚臣 |
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| 作者单位： | College of Electronic Engineering;Physics Group;College of Physics |
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| 基金项目： | supported by the Science and Technology Project of Heilongjiang Education Department(No.11531283). |
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| 摘 要： | The dipole resonances of gold nanocages were investigated theoretically using finite difference time domain method.The results show that field enhancement is obtained at the walls of the gold nanocages.It is believed that the effect can cause a strong optical nonlinear property.To test the hypothesis,nonlinear absorption was investigated using a broadband 5 ns Z scan.It was found that at low intensities the sample shows saturable absorption(SA),while at higher intensities a switch from SA to reverse SA occurs.Moreover,the nonlinear absorption of the sample is sensitively wavelength-dependent,and,in the resonant region,saturation intensity is the largest.
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| 关 键 词： | saturable ABSORPTION reverse saturable ABSORPTION GOLD NANOCAGES FDTD Z-SCAN |
Wavelength-dependent nonlinear absorption of gold nanocages |
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| Shuang Chen,Suying Yang,YanHuang,Weiyan Jiao,Guanghua Fan,Yachen Gao.Wavelength-dependent nonlinear absorption of gold nanocages[J].中国光学快报(英文版),2020(1):70-74. |
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| Authors: | Shuang Chen Suying Yang YanHuang Weiyan Jiao Guanghua Fan Yachen Gao |
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| Institution: | (College of Electronic Engineering,Heilongjiang University,Harbin 150080,China;Physics Group,Chaoyang Medical School,Chaoyang 122000,China;College of Physics,Harbin Institute of Technology,Harbin 150001,China) |
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| Abstract: | The dipole resonances of gold nanocages were investigated theoretically using finite difference time domain method. The results show that field enhancement is obtained at the walls of the gold nanocages. It is believed that the effect can cause a strong optical nonlinear property. To test the hypothesis, nonlinear absorption was investigated using a broadband 5 ns Z scan. It was found that at low intensities the sample shows saturable absorption(SA), while at higher intensities a switch from SA to reverse SA occurs. Moreover, the nonlinear absorption of the sample is sensitively wavelength-dependent, and, in the resonant region, saturation intensity is the largest. |
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