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首页> 外文会议>Optical Materials in Defence Systems Technology >Surface charge screening and boundary conditions for high two-beam coupling gain in pure liquid crystals
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Surface charge screening and boundary conditions for high two-beam coupling gain in pure liquid crystals

机译：纯液晶中高双束耦合增益的表面电荷筛选和边界条件

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We report on asymmetric two-beam coupling and the ways of controlling it in liquid crystals cells with photoconducting polymer layers. The cells had one of the substrates covered with a photoconductive polymer layer, namely PVK, photosensitised with C_(60) to respond to visible light. Efficient gain was measured in 30 μm thick cells with two incident beams having the same intensity. We present a model of two-beam coupling gain based on the build-up and discharge of surface charge screening layers, spatially modulated due to the photoconductivity of doped PVK. The simulation of electric field distribution inside a liquid crystal cell for different two-beam coupling grating spacing showed different penetration of field into the liquid crystal bulk. The characteristics of dynamics, magnitude of two-beam coupling and the efficiency of diffraction were determined for different values of applied DC field, cell configuration and liquid crystals. We found that the direction of energy flow was determined just by the cell tilt and not by the DC field bias.
机译：我们报告了不对称的两束耦合及其在具有光导聚合物层的液晶单元中控制它的方式。电池具有被光电导聚合物层（即PVK）覆盖的衬底之一，该聚合物被C_（60）光敏以响应可见光。在具有相同强度的两个入射光束下，在30μm厚的单元中测量了有效增益。我们基于表面电荷屏蔽层的建立和放电，基于掺杂的PVK的光电导性进行了空间调制，提出了一个两束耦合增益模型。在不同的两光束耦合光栅间距下，液晶盒内部的电场分布模拟显示出不同的电场穿透到液晶体中。对于不同的外加直流电场值，晶胞结构和液晶，确定了动力学特性，两束耦合的大小和衍射效率。我们发现，能量流的方向仅由单元倾斜而不是由直流电场偏置确定。

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