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利用脉冲激光沉积技术制备了掺杂金纳米颗粒的钛酸钡复合薄膜Au-BaTiO3,用高分辨透射电镜和X射线光电子能谱对薄膜进行了表征。从透射电镜照片可以看出,制备的样品中金颗粒大小约为2~3 nm,呈球形,均匀分布在载体介质中。X射线光电子能谱给出了Ba3d、Ti2p和Au4f电子芯能级结合能,结果表明载体介质是以BaTiO3的形式存在,而Au以金属的状态掺杂其中。330~800 nm范围的线性吸收谱表明样品中Au颗粒的共振吸收峰在500 nm附近。用单光束纵向扫描方法测量了样品的三阶非线性光学效应,使用的光源为调Q的YAG激光器,波长为532 nm,脉宽为10 ns,得到的非线性折射率和非线性吸收系数分别为-2.42×10-6esu和2.22×10-6m/W,表明了Au-BaTiO3复合薄膜有较大的非线性光学响应。
Gold-doped barium titanate composite films Au-BaTiO3 were prepared by pulsed laser deposition. The films were characterized by high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy. It can be seen from the TEM images that the gold particles in the prepared sample have a size of about 2-3nm, which is spherical and uniformly distributed in the carrier medium. X-ray photoelectron spectroscopy gives the energy levels of Ba3d, Ti2p and Au4f electron-core binding energy, the results show that the carrier medium is in the form of BaTiO3, while Au is doped into the metal state. The linear absorption spectrum in the range of 330-800 nm shows that the resonance absorption peak of Au particles in the sample is around 500 nm. The third-order nonlinear optical effect of the sample was measured by a single beam longitudinal scanning method. The used light source was a Q-switched YAG laser with a wavelength of 532 nm and a pulse width of 10 ns. The obtained nonlinear refractive index and nonlinear absorption coefficient -2.42 × 10-6esu and 2.22 × 10-6m / W, indicating that the Au-BaTiO3 composite film has a larger nonlinear optical response.