Chromophore orientation dynamics, phase stability, and photorefractive effects in branched azobenzene chromophores

被引:17
作者
Campbell, VE
In, I
McGee, DJ
Woodward, N
Caruso, A
Gopalan, P [1 ]
机构
[1] Univ Wisconsin, Madison, WI 53706 USA
[2] Drew Univ, Dept Phys, Madison, NJ 07940 USA
关键词
D O I
10.1021/ma051772o
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The increased solubility and uniform dispersal of branched azobenzene chromophores over their monomeric analogues have been shown to improve the electrooptic performance of high glass transition temperature (T-g) blended polymers. We report here the application of these branched chromophores as guest nonlinear optical molecules in the plasticized low-T-g photoconducting host polymer poly(vinylcarbazole) and demonstrate the presence of orientationally enhanced photorefractive index gratings. When compared with their monomeric analogues, branched chromophores were compatible over a broader range of concentrations and resulted in higher quality optical films; these films have retained their optical clarity for I year. A new branched electrooptic chromophore with r(33) of 14 pm/V at 1550 nm was synthesized and exhibited photorefractive two-beam coupling over a range of applied fields, including a net two-beam coupling amplification coefficient of 6.4 cm(-1) at 780 nm.
引用
收藏
页码:957 / 961
页数:5
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