聚合物薄膜中生色团分子间的相互作用对其宏观二阶非线性的影响  

EFFECT OF THE ELECTROSTATIC INTERACTIONS OF CHROMOPHORES ON THE MACROSCOPIC SECOND-ORDER NONLINEAR OPTICAL PROPERTIES OF THE POLYMER FILMS 

作　　者：史伟[1] 房昌水[1] 徐志凌[2] 潘奇伟[1] 赵显[1] 顾庆天[1] 许东[1] 余金中[3] 

机构地区：[1]山东大学晶体材料国家重点实验室,济南250100 [2]复旦大学物理系,三束材料改性国家重点实验室,上海200433 [3]中国科学院半导体研究所光电子国家重点实验室,北京100083

出　　处：《物理学报》2000年第5期904-910,共7页Acta Physica Sinica

基　　金：国家自然科学基金!(批准号 :69990 5 40 )资助的课题&&

摘　　要：制备了 3 (1,1 二氰基噻吩 ) 1 苯 4,5 二羟基 H 噻唑 (DCNP)与聚醚醚酮 (PEK c)组成的主客掺杂聚合物薄膜 ,用Maker条纹法测量了不同掺杂浓度下薄膜的二阶非线性系数 χ3 3 (2 ) .实验结果表明 ,聚合物中生色团的含量高到一定程度 ,其宏观二阶非线性随生色团含量的增加反而下降 .本文在考虑聚合物中生色团分子相互作用的情况下 ,修正了聚合物宏观二阶非线性与生色团的含量之间的关系 ,此时聚合物宏观二阶非线性与生色团的含量已非简单的正比关系 .讨论了生色团分子间的相互作用对聚合物宏观二阶非线性的影响 。The polyetherketone (PEK\|c) guest\|host system thin films doped with 3\|(1,1\|dicyanothenyl)\|1\|phenyl\|4,5\|dihydro\|1H\|pryazole (DCNP) were prepared. Their second\|order nonlinear optical (NLO) coefficients χ 33 (2) were measured by using Maker fringe method for the polymer films doped with different weight percents of DCNP. Experimental results indicate that the second\|order NLO properties of the poled polymer films could decrease with the chromophore loading increasing when the chromophore loading reaches a fairly high level. In this paper, the relationship between the macroscopic second\|order NLO coefficient and the chromophore number density was modified under considering the role of the electrostatic interactions of chromophores in the polymer film. According to the modified relationship, the macroscopic second\|order NLO coefficient is no longer in direct proportion with the chromophore number density in the polymer film. The effect of the electrostatic interactions of chromophores on second\|order NLO properties was discussed. The attenuation of the macroscopic second\|order NLO activity can be demonstrated by the role of the chromophore electrostatic interactions at high loading of chromophore in the polymer systems.

关 键 词：聚合物薄膜 生色团分子 相互作用 二阶非线性 

分 类 号：O484[理学—固体物理]