Wang Weitian, Yang Guang, Chen Zhenghao, Lu Huibin, Zhou Yueliang, Yang Guozhen, Kong Xiang
Laboratory of Optical Physics, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China.
Appl Opt. 2003 Sep 20;42(27):5591-5. doi: 10.1364/ao.42.005591.
Composite thin films Au:BaTiO3, comprising nanometer-sized gold particles embedded in barium titanate matrices, were synthesized on MgO (100) substrates with the pulsed laser deposition technique. The nanostructure of the films and the size distributions of the Au particles were analyzed by high-resolution transmission electron microscopy. Crystal lattice fringes from the Au nanocrystals and the BaTiO3 matrices were observed. The nonlinear optical properties of the Au:BaTiO3 films were measured with the z-scan method at a wavelength of 532 nm, which was closed to the surface plasmon resonance of nanoscale Au particles. The features of the closed-aperture z-scan transmittance curves were affected by the ratio, which increased greatly at a high metal concentration, of the imaginary part to the real part of the third-order nonlinear susceptibility chi(3).
采用脉冲激光沉积技术在MgO（100）衬底上合成了复合薄膜Au:BaTiO₃，该薄膜由嵌入钛酸钡基体中的纳米级金颗粒组成。通过高分辨率透射电子显微镜分析了薄膜的纳米结构和金颗粒的尺寸分布。观察到了金纳米晶体和钛酸钡基体的晶格条纹。采用z扫描方法在波长532nm下测量了Au:BaTiO₃薄膜的非线性光学性质，该波长接近纳米级金颗粒的表面等离子体共振。封闭孔径z扫描透射率曲线的特征受到三阶非线性极化率χ(3)的虚部与实部之比的影响，该比值在高金属浓度下大幅增加。
