PHOTOREFRACTIVE EFFECTS OBSERVED IN THE ORGANIC-CRYSTAL 2-CYCLOOCTYLAMINO-5-NITROPYRIDINE DOPED WITH 7,7,8,8-TETRACYANOQUINODIMETHANE

被引:151
作者
SUTTER, K
HULLIGER, J
GUNTER, P
机构
[1] Institute of Quantum Electronics, Swiss Federal Institute of Technology, ETH Hönggerberg
关键词
D O I
10.1016/0038-1098(90)90952-8
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
For the first time photorefractive effects have been observed in 2-cyclooctylamino-5-nitropyridine (COANP) single crystals doped with 7,7,8,8-tetracyanoquinodimethane (TCNQ). Light induced refractive gratings with diffraction efficiencies up to 0.1% have been measured. The results of holographic and beam coupling experiments for different light polarizations indicate that the effect is based on a light induced charge separation and a refractive index change due to the electron-optic effect of the resulting space-charge field. It is demonstrated that photoabsorption or photo chemical refractive index changes can be excluded as mechanisms for the observed effects. © 1990.
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页码:867 / 870
页数:4
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