有机二阶非线性光学材料综合性能的优化策略  

Optimization strategies for comprehensive performance of organic second-order nonlinear optical materials

作　　者：乔盼盼 李倩倩[1] 李振[1] Panpan Qiao;Qianqian Li;Zhen Li(College of Chemistry and Molecular Sciences,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学化学与分子科学学院,武汉430072

出　　处：《科学通报》2023年第30期4015-4034,共20页Chinese Science Bulletin

摘　　要：二阶非线性光学材料在激光技术中发挥着非常重要的作用,寻找综合性能优良的有机二阶非线性光学材料一直是材料和光学领域的前沿方向.目前的研究重点主要在于合成具有高二阶非线性光学效应和取向稳定性以及低光学损耗的非线性光学高分子材料,以更好满足高性能光学器件的制作要求.近几十年来,在多种分子模型及理论计算的支持下,科学家相继开发出许多行之有效的策略和方法,在这一领域取得了多方面重要的开拓性研究进展.本文首先介绍有机二阶非线性光学材料的核心构筑单元——生色团的设计与优化,阐述了共轭桥和电子给受体的结构对其微观二阶非线性光学性质的影响;然后结合“位分离”原理和“合适间隔基团”概念,总结了有效转换生色团的微观二阶非线性光学性质到材料宏观二阶非线性光学性能的策略和方法.在此基础上,围绕此类材料中存在的“非线性-稳定性”矛盾以及“非线性-透光性”矛盾探讨了综合性能优化的策略,从多角度归纳了分子设计的基本原则与改进方案以及分子聚集结构调控的有效途径.最后,针对该材料体系在实际应用中面临的关键挑战,对该领域未来的研究发展方向进行了讨论与展望.With the rapid development of optical communication and information processing,second-order nonlinear optical materials have shown great potential applications in optical waveguide devices,such as frequency exchange,signal processing and transmission and data storage.Recently,second-order nonlinear optical materials have also achieved great progress in the fields of biology,sensing and optoelectronics.The second-order nonlinear optical materials studied in the early stage were mostly inorganic crystal or semiconductor crystal materials,whose development is relatively mature and has been commercialized.However,the inherent shortcomings(such as high dielectric constant and half-wave voltage,more brittle crystal and difficult to grow,etc.)make their development be limited.In contrast,organic compounds have the advantages of fast response,low dielectric constant,high optical damage threshold,low cost,and easy to be processed with modified molecular structure.In the early 1980s,Meredith et al.proposed for the first time the concept of polarized polymer electro-optical materials.The materials can exhibit macroscopic second-order nonlinear optical effects due to the non-centrosymmetric arrangement of chromophores regulated by electric poling.Thereafter,poled polymers have attracted extensive attention and flourished in this field,and many organic second-order nonlinear optical materials with excellent comprehensive properties have been designed and synthesized.Unfortunately,no material system has been developed that can simultaneously satisfy the practical requirements of“sufficiently large macroscopic nonlinear optical effects,good stability and low optical loss as possible”.The significant contradictions of“nonlinearity-stability”and“nonlinearity-transparency”make it very difficult for organic second-order nonlinear optical materials to meet the above three requirements simultaneously.This review focuses on the comprehensive performance optimization of poled polymer materials.Firstly,we introduce the desig

关 键 词：二阶非线性光学材料 生色团 合适间隔基团 分子排列 分子聚集态调控 

分 类 号：TB34[一般工业技术—材料科学与工程]