对称破缺参数对极化子线性和非线性极化率的影响  

Effects of Symmetry Break Term to Linear and Nonlinear Optical Polarization of Charged Polaron in Conjugated Polymer

作　　者：王亚东[1] 杨建光[1] 陈建军[1] 

机构地区：[1]张家口职业技术学院基础部,河北张家口075000

出　　处：《河北北方学院学报（自然科学版）》2008年第5期7-10,共4页Journal of Hebei North University:Natural Science Edition

基　　金：河北省科学技术研究与发展指导计划(07215106)

摘　　要：目的通过理论计算及其结果分析,为同领域内的科学试验与生产实践提供有价值的理论线索.方法采用一维紧束缚的Su-Schrieffer-Heeger(SSH)及其扩展模型,模拟了极化子的几何结构和电子特征,并利用有限场方法计算携带有极化子的聚合物链的线性和非线性光学极化率.结果得到不同链长条件下,不同对称破缺参数时,极化子线性和非线性光学极化率随分子链长的变化关系.结论极化子元激发诱导了大的线性和非线性光学极化率;对称破缺项增强极化子的线性和非线性极化;对称破缺项对线性极化的影响与分子链长有关.Objective To provide valuable theoretical clues for industrial manufactures and experiments in the same field with theoretical calculation and result analysis. Methods Based on the tight-binding Su-Schrieffer-Heeger （SSH） and its extended model, the geometrical structure and electronic properties are simulated, and linear and nonlinear optical polarizability of charged polaron in conjugated polymer chains are calculated by finite-field method. Results The chain-length dependence of linear and nonlinear optical p.olarizability of charged polaron in polymeric chain at different chain-lengths and different symmetry breaking term were obtained. Conclusion Polaron induces large linear and nonlinear optical susceptibility. Symmetry breaking term increases linear and nonlinear optical polarization of polaron. Effects of symmetry breaking term to linear optical polarization rely on lengths of polymer chains.

关 键 词：共轭聚合物 极化子 极化率 对称破缺参数 

分 类 号：O437[机械工程—光学工程]