Linear and nonlinear optical properties of Ag nanocluster/BaTiO3 composite films
Linear and nonlinear optical properties of Ag nanocluster/BaTiO3 composite films
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DOI：
10.1063/1.1522832
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发表时间：
2002-11
影响因子：
4
通讯作者：
Guang Yang;Weitian Wang;Yue-liang Zhou;Hui‐bin Lu;Guo‐zhen Yang;Zheng-hao Chen
中科院分区：
文献类型：
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作者：
Guang Yang;Weitian Wang;Yue-liang Zhou;Hui‐bin Lu;Guo‐zhen Yang;Zheng-hao Chen
为了研究金属纳米团簇/氧化物复合薄膜的光学性质，采用脉冲激光沉积法在MgO（100）衬底上制备了Ag纳米团簇/BaTiO 3复合薄膜。X射线衍射结果表明，Ag和BaTiO 3结晶良好。X射线光电子能谱分析表明，样品是由纳米金属Ag嵌入BaTiO 3基体中组成的。在300 ~ 800 nm范围内测量了其光吸收特性，并观察到了由Ag粒子的表面等离子体共振引起的吸收峰。随着Ag掺杂浓度的增加，吸收峰增大并向长波方向移动（红移）。z扫描结果表明，薄膜具有较大的光学非线性，非线性吸收系数β和非线性折射率n2的符号随着Ag掺杂量的增加而改变。
To investigate the optical properties of metallic nanocluster/oxide composite films, Ag nanocluster/BaTiO3 composite films were synthesized on MgO (100) substrates by co-depositing the Ag and BaTiO3 targets using pulsed laser deposition. The x-ray diffraction results demonstrated that the Ag and BaTiO3 were well crystallized. The x-ray photoelectron spectroscopy analysis indicated that the samples were composed of nano-metal Ag embedded in the BaTiO3 matrices. The optical absorption properties were measured from 300 to 800 nm, and the absorption peaks due to the surface plasmon resonance of Ag particles were observed. With increasing the Ag concentration, the peak absorption increased and shifted to longer wavelength (redshift). Furthermore, the z-scan results showed that the films exhibited large optical nonlinearities and the signs of the nonlinear absorption (β) and nonlinear refractive index (n2) changed with increasing the Ag concentration.