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首页> 外文期刊>Optics Letters >Optical two-beam coupling for a surface-induced photorefractive effect in undoped liquid crystals
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Optical two-beam coupling for a surface-induced photorefractive effect in undoped liquid crystals

机译：光学两光束耦合在未掺杂液晶中产生表面诱导的光折变效应

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摘要

We report beam-coupling measurements of undoped nematic planar cells, for which the surface-induced photorefractive effect (SIPRE) has been confirmed to be due to photoelectric interface activation. We show that the energy transfer strongly depends on experimental geometry. Diffraction efficiency and beam-coupling analyses suggest that the unusual local and (or) nonlocal behavior can be ascribed to an additional in-phase-modulated longitudinal electric field component, unaccountable by standard photorefractivity. We consider a simple charge distribution model of the SIPRE, which produces a space-charge field having two orthogonal modulated components, in phase and π/2 out of phase. Through the liquid crystal's electric response, the exploited geometries verify the presence of the two components.
机译：我们报告了未掺杂的向列平面细胞的束耦合测量，其表面诱导的光折射效应（SIPRE）已被确认是由于光电界面激活。我们证明了能量转移在很大程度上取决于实验几何。衍射效率和光束耦合分析表明，异常的局部和（或）非局部行为可归因于附加的同相调制的纵向电场分量，这是标准光折射性无法解释的。我们考虑一个简单的SIPRE电荷分布模型，该模型会产生一个具有两个正交调制分量，同相和π/ 2异相的空间电荷场。通过液晶的电响应，所利用的几何形状验证了这两种成分的存在。

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