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Simple fabrication of liquid crystalline grating cells with homogeneous and twisted nematic structures and effects of orientational relaxation on diffraction properties

机译：具有均匀和扭曲向列结构的液晶光栅单元的简单制造以及取向弛豫对衍射特性的影响

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摘要

We have substantiated a simple yet efficient, competitive, and practical method to automatically fabricate liquid crystalline grating cells with homogeneous or twisted nematic (TN) structures by one-step ultraviolet holographic exposure on an empty glass cell coated with a photocrosslinkable polymer liquid crystal with 4-(4-methoxycinnamoyloxy)biphenyl side group (P6CB) films. The polarization diffraction properties in the resultant liquid crystalline grating cells have also been investigated extensively by varying the grating pitch. The theoretical considerations on the basis of elastic continuum theory revealed that accumulation of elastic free-energy density due to the TN structure affected the diffraction properties, although the strong anchoring of our photoalignment material contributed effectively to form the expected spatial distribution of liquid crystalline directors in the grating cells.
机译：我们已经证实了一种简单但有效，有竞争性且实用的方法，该方法通过在涂有光交联聚合物液晶的空玻璃单元上进行一步式紫外全息曝光，自动制造具有均相或扭曲向列（TN）结构的液晶光栅单元。 -（4-甲氧基肉桂酰氧基）联苯侧基（P6CB）薄膜。通过改变光栅间距，也广泛地研究了所得液晶光栅单元中的偏振衍射特性。基于弹性连续体理论的理论考虑表明，尽管我们的光取向材料的牢固锚固有效地形成了预期的液晶指向矢的空间分布，但由于TN结构导致的弹性自由能密度的积累影响了衍射性能。光栅单元。

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