The role of surface charge field in two-beam coupling in liquid crystal cells with photoconducting polymer layers

被引:98
作者
Kaczmarek, M [1 ]
Dyadyusha, A
Slussarenko, S
Khoo, IC
机构
[1] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England
[2] Natl Acad Sci, Inst Phys, UA-03028 Kiev, Ukraine
[3] Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA
基金
英国工程与自然科学研究理事会;
关键词
D O I
10.1063/1.1778818
中图分类号
O59 [应用物理学];
学科分类号
摘要
In liquid crystal cells with photoconductive poly(N-vinlyl carbazole) polymer layers, an external dc field can be completely screened by surface charge layers that develop at the liquid crystal-polymer interface. Under spatially modulated illumination, surface charge layers can be discharged in bright areas and lead to reorientation and spatially modulated Freedericksz transition. As a result, an asymmetric energy exchange in the photorefractive two-beam coupling process can take place. We propose a model to explain the origin of reorientation and phase shift in the two-beam coupling process, based on the profile and tilt of the refractive index grating. We also show that cells with just one photoconducting layer are more efficient than a typical design with two layers. (C) 2004 American Institute of Physics.
引用
收藏
页码:2616 / 2623
页数:8
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