手性分子的非线性极化模型

The Models for Nonlinear Polarization of Chiral Molecules

综述了三种已用于手性介质非线性研究的经典分子模型，螺旋单电子模型、耦合双振子模型和双各向异性基团分子模型．讨论了这些模型的特点和使用情况，预计了这些模型的研究趋势．研究了适于螺旋单电子模型的手性介质的二次谐波产生过程，以及适于耦合双振子模型的手性介质的和频产生过程．认为从建立正确的分子极化模型出发，描述分子介质的宏观非线性性质是手性介质非线性光学中的一个很有效方法，将对丰富非线性光学理论做出应有的贡献．

The three classical molecular models used to study the nonlinearity of chiral media, i.e. the single-electron-model on a helix, two-coupled-vibrator model and bi-anisotropic-group-model, are summarized by emphasizing the former two models. The model characteristics and their uses are discussed. The research tendency in development of the models is predicted. The model uses are described in details through the processes investigated by our group, such as, SHG and SFG in the chiral media suitable for single-electron-model and two-coupled-vibrator model. We are sure that it is a very efficient method to describe the nonlinearity of a chiral medium by starting from build-up a correct molecular model. It is believed that our work will make a contribution to enrich the theoretical system of nonlinear optics.