Second-order nonlinear-optical processes in orientationally ordered materials: relationship between molecular and macroscopic properties
Second-order nonlinear-optical processes in orientationally ordered materials: relationship between molecular and macroscopic properties
复制标题
定向有序材料中的二阶非线性光学过程：分子和宏观性质之间的关系
DOI：
10.1364/josab.4.000968
复制
发表时间：
1987
影响因子：
1.9
通讯作者：
J. E. Sohn
中科院分区：
文献类型：
--
作者：
K. Singer;M. Kuzyk;J. E. Sohn
液晶和聚合物玻璃可以通过将材料的温度升高到分子运动大大增强的温度，施加外部配向场，然后用所施加的场冷却而形成为取向有序的材料。所得材料表现出二阶非线性光学效应。本文给出了分子超极化率与宏观磁化率的关系。的敏感性被认为是依赖于通常与液晶相关联的微观序参数，并讨论了在一维分子和极化聚合物玻璃的限制。协议之间的理论和二次谐波产生测量聚合物玻璃。电光测量的结果进行了比较，与二次谐波产生的测量表明，电光效应主要是电子的起源。
Liquid crystals and polymer glasses can be formed into orientationally ordered materials by raising the temperature of the material to a temperature at which molecular motion is greatly enhanced, applying an external aligning field, and then cooling with the field applied. The resulting material exhibits second-order nonlinear-optical effects. In this paper, the relationship between the molecular hyperpolarizability and the macroscopic susceptibility is presented. The susceptibility is seen to depend on the microscopic order parameters commonly associated with liquid crystals and is discussed in the limits of one-dimensional molecules and poled polymer glasses. Agreement is found between the theory and second-harmonic-generation measurements of polymer glasses. Results of electro-optic measurements are compared with second-harmonic-generation measurements that suggest that the electro-optic effect is mostly electronic in origin.