Spontaneous and stable uniform lying helix liquid-crystal alignment
Spontaneous and stable uniform lying helix liquid-crystal alignment
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自发且稳定的均匀螺旋液晶排列
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
S. Elston
中科院分区：
文献类型：
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作者：
B. Outram;S. Elston
与现有液晶技术相比，均匀螺旋（ULH）几何形状中的柔性电光效应可以提供许多优势，但可靠地形成 ULH 一直存在问题。在这里，我们利用弱垂直排列条件和单向凹槽表面轮廓的组合，在厚度范围为 1 至 7μm 的器件中实现了自发、稳定和可重复的具有正介电各向异性和负介电各向异性的材料的 ULH 排列，而无需任何现场应用或流诱导排列。该技术需要从各向同性相缓慢冷却到蓝相。使用该技术制造的设备显示亚毫秒和线性电光响应。
The flexoelectro-optic effect in the uniform lying helix (ULH) geometry could provide many advantages over existing liquid-crystal technologies, however reliably forming the ULH has been problematic. Here, we achieve spontaneous, stable, and repeatable ULH alignment for materials with both positive and negative dielectric anisotropy in devices ranging from 1 to 7 μm in thickness without the need for any field application or flow-induced alignment, using a combination of weak homeotropic alignment conditions and unidirectional grooved surface profiles. The technique requires slow cooling from the isotropic phase and through the blue phase. Devices made using the technique display sub-millisecond and linear electro-optical responses.