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Liquid crystal necklaces: cholesteric drops threaded by thin cellulose fibres

机译:液晶项链:由细纤维素纤维穿入的胆甾型滴剂

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摘要

Liquid crystals in confined geometries exhibit numerous complex structures often including topological defects that are controlled by the nematic elasticity, chirality and surface anchoring. In this work, we study the structures of cholesteric droplets pierced by cellulose fibres with planar anchoring at droplet and fibre surfaces. By varying the temperature we demonstrate the role of twisting power and droplet diameter on the equilibrium structures. The observed structures are complemented by detailed numerical simulations of possible director fields decorated by defects. Three distinct structures, a bipolar and two ring configurations, are identified experimentally and numerically. Designing cholesteric liquid crystal microdroplets on thin long threads opens new routes to produce fibre waveguides decorated with complex microresonators.
机译:有限几何形状的液晶表现出许多复杂的结构,通常包括拓扑缺陷,这些缺陷由向列弹性,手性和表面锚定来控制。在这项工作中,我们研究了纤维素纤维刺穿的胆甾型液滴的结构,并在液滴和纤维表面进行了平面锚固。通过改变温度,我们证明了扭曲力和液滴直径对平衡结构的作用。观察到的结构得到了由缺陷修饰的可能的指向矢场的详细数值模拟的补充。通过实验和数值确定了三种不同的结构,即双极结构和两个环结构。在细长螺纹上设计胆甾型液晶微滴,开辟了一条新路线,以生产装饰有复杂微谐振器的光纤波导。

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