新型非线性光学杂化材料结构与性能的研究

Studies on the Relationship Between Structure and Properties of New Second-order Nonlinear Optical Hybrid Material

由硅烷染料 ASD与钛酸四正丁酯在酸性条件下共水解、缩合得到杂化材料 ,利用透射电镜 ( TEM)和X射线能量色散谱仪 ( EDS)进行分析 ,结果表明 ,杂化溶胶粒子是由硅和钛的化合物组成的球形纳米粒子 .由一维刚性取向气体模型计算杂化材料膜再极化后的二阶非线性光学系数χ(2 ) 为 1 .4 3× 1 0 - 7esu.差示扫描量热法 ( DSC)测得杂化材料的玻璃化温度可达 4 6 9K;用紫外 -可见光谱对杂化膜在极化前后的取向及取向稳定性进行了研究 .用原子力显微镜 ( AFM)和 X射线衍射 ( XRD)研究了材料在极化过程中的结晶行为和微观结构对生色团取向稳定性的影响 ,初次在这种极化后的膜中观察到了介观结构 .

A new type of organic chromophore group/SiO 2-TiO 2 second-order nonlinear optical(NLO) materials has been obtained by sol-gel process. The research by X-ray energy dispersion spectrum(EDS) and Transmission electronic microscope(TEM) shows that the hybrid sol particles consist of SiO 2, TiO 2 and the organic chromophore group, and the size of the particles is about 20-80 nm. The second-order nonlinear optical polarizability χ (2) of the poled hybrid films is 1.43×10 -7 esu according to one dimensional rigid oriented gas model(1DROGM). The poled film exhibits a good orientation stability, and its glass transition temperature can reach 469 K. The crystallization and micro-structure of hybrid films were analyzed by X-ray diffraction (XRD) and atom force microscope(AFM), and the mesostructure was discovered in the NLO hybrid films.