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Study of azo dye surface command photoalignment material for photonics applications

机译：光子学中偶氮染料表面指令光取向材料的研究

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摘要

We provide detailed quantitative characterization of sulfonic bisazodye SD1 as a photoalignment material for photonics applications. The reversibility of photoalignment was tested for transformations between planar and 90 deg twist orientation states in a liquid crystal (LC) cell using polarized UV light. No degradation was observed for 100 cycles of transformations. A given twist angle of the LC orientation was obtained in a single step, as well as in a sequence of gradually increasing angles. A hysteresis is revealed in the latter case for planar-twist-planar cycles. The material was used for obtaining patterned orientation of a LC polymer providing similarly good quality photoalignment for UV as well as visible light. High efficiency large area and high spatial frequency optical axis gratings (or, polarization gratings) were demonstrated on a polycarbonate substrate. We show the opportunity of obtaining photoalignment in a multilayer system with single exposure to a polarized light. Finally, we provide evidence of a positive feedback in the dynamics of photoalignment due to the orientational effect of an increasing number of aligned molecules.
机译：我们提供了作为光子学应用的光取向材料的磺酸双偶氮染料SD1的详细定量表征。测试了光取向的可逆性，以便在液晶（LC）单元中使用偏振UV光在平面和90度扭曲取向状态之间进行转换。 100次转化循环未观察到降解。 LC方向的给定扭曲角可以一步一步获得，也可以按一系列逐渐增加的角度获得。在后一种情况下，对于平面扭曲-平面循环，会出现滞后现象。该材料用于获得LC聚合物的图案化取向，从而为UV和可见光提供类似的高质量光取向。在聚碳酸酯基板上展示了高效的大面积和高空间频率光轴光栅（或偏振光栅）。我们展示了在单次暴露于偏振光的多层系统中获得光取向的机会。最后，由于越来越多的对准分子的定向作用，我们提供了光对准动力学的积极反馈的证据。

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