Light-driven rotation of gratings formed by electroconvection patterns in cholesteric liquid crystals

Light-driven rotation of gratings formed by electroconvection patterns in cholesteric liquid crystals
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胆甾型液晶中电对流图案形成的光栅的光驱动旋转

DOI:
10.1016/j.molliq.2021.116366
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发表时间:
2021-05
影响因子:
6
通讯作者:
ying xiang
ying xiang
中科院分区:
化学2区
文献类型:
--
作者:
ying xiang

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虽然由固体结构材料制成的形态光栅具有永久周期性,但周期性流引起的光栅利用图案形成机制及其对材料特性的依赖性提供了广泛的可调性。作为这种流动的范例,这里报道了在含有手性光敏掺杂剂的混合排列胆甾型液晶中电场引起的图案(电对流的表现)。紫外光照射通过改变螺距来旋转图案,其中旋转角度的大小和方向取决于紫外光强度、手性掺杂剂的浓度和类型。演示了一种能够进行二维光束控制的原型光栅。这种可调性将引导化学家寻找智能分子结构,以便在开发具有所需参数的光子器件时控制复杂流体。
While morphological gratings made of solid structural materials have permanent periodicity, gratings induced by a periodic flow provide wide tunability utilizing the pattern formation mechanism and its dependence on the material properties. As a paradigm of such flow, here electric-field induced patterns, manifestations of electroconvection, are reported in a hybrid aligned cholesteric liquid crystal containing a chiral photosensitive dopant. The irradiation by UV light rotates the pattern via alteration of the helical pitch, where the magnitude and direction of the rotation angle depends on the UV light intensity, the concentration and type of the chiral dopant. A prototype grating capable of two-dimensional beam steering is demonstrated. Such tunability will guide chemists to search for smart molecular structures so as to control complex fluids in developing photonic devices with desired parameters.
DOI: 10.1063/1.98731
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