【摘要】 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。更多还原

【Abstract】 Composite films with nanoscale Au particles uniformly embedded in BaTiO₃ matrices（Au-BaTiO₃） were prepared by using pulsed laser deposition（PLD） technique.High-resolution transmission electron microscope（TEM） and X-ray photoelectron spectroscope（XPS） were used to characterize the films.It could be seen from the TEM micrographs that the film exhibited a very homogeneous distribution of spherical Au particles.The diameter of the Au particles was estimated to be 2～3 nm.The X-ray photoelectron core-level spectra of Ba3d,Ti2p and Au4f lines were presented and suggested the films were composed of metal Au embedded BaTiO₃ matrix.The optical absorption of the films was measured in the wavelength range of 330～800 nm,and the absorption peak due to the surface plasmon resonance of Au particles was found around 500 nm.The third-order optical nonlinearity of the composite films was investigated by the Z-scan method using a Q-switched Nd∶YAG laser with a wavelength of 532 nm and a pulse width of 10 ns.The nonlinear refractive index n₂ and the nonlinear absorption coefficient β were determined to be-2.42×10^-6 esu and 2.22×10^-6 m/W,which showed that the Au-BaTiO₃ thin films had a large nonlinear optical susceptibility.更多还原