Reconfigurable topological defect arrays in nematic liquid crystals
Reconfigurable topological defect arrays in nematic liquid crystals
复制标题
向列液晶中的可重构拓扑缺陷阵列
DOI：
10.1117/12.2251314
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Fumito Araoka,1 and Hiroshi Orihara
中科院分区：
文献类型：
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作者：
V. S. R. Jampani Yuji Sasaki;Khoa V. Le;Fumito Araoka,1 and Hiroshi Orihara
近几年来，液晶中的拓扑缺陷在产生涡旋光束方面引起了人们的广泛关注。在大多数情况下，复杂的缺陷结构是稳定的预图案化的表面和自发控制与可重构性并没有那么成功地实现。在这里，我们使用的NLC与负介电各向异性掺杂有少量的离子杂质之间的全氟聚合物表面限制。在不使用模板的情况下，大量的拓扑缺陷通过使用AC电压的NLC的重新取向而稳定，这是由全氟聚合物界面处的离子的周期性密度调制引起的。由于系统的可重构性，可以通过多种方法获得均匀的单畴，例如，红外激光和弱剪切流。我们的结果提供了一种新的方法来稳定多个拓扑缺陷。
Topological defects in nematic liquid crystals (NLCs) are attracting attention in recent years for generating optical vortex beams. In most cases, complex defects structures are stabilized by pre-patterned surfaces and spontaneous control with reconfigurability is not so successfully realized. Here, we use NLCs with negative dielectric anisotropy doped with a small quantity of ionic impurity confined between perfluoropolymer surfaces. Without using a template, a large number of topological defects are stabilized by the reorientation of the NLCs using an AC voltage, which is caused by a periodic density modulation of ions at the perfluoropolymer interfaces. Due to the reconfigurable property of the system, the uniform monodomain can be obtained by several methods, for example, an infrared laser and a weak shear flow. Our results offer a new approach for stabilizing multiple topological defects.