Cholesteric Metronomes with Flexoelectrically Programmable Amplitude,Advanced Optical Materials

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Cholesteric Metronomes with Flexoelectrically Programmable Amplitude
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-04-10 , DOI: 10.1002/adom.201800013
Vinay Joshi ₁ , Kai-Han Chang ₁ , Andrii Varanytsia ₁ , Daniel A. Paterson ₂ , John M. D. Storey ₂ , Corrie T. Imrie ₂ , Liang-Chy Chien ₁

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Replicating natural phenomena using soft material actuators is a major challenge for material scientists. For example, a metronome is a device that produces an audible beat at a selected interval. In anisotropic soft materials, a flexoelectrically‐driven cholesteric liquid crystal (CLC) can display a metronome‐like swinging effect when an applied electric field is normal to the helices of a CLC that are aligned normal to the substrates. The amplitude and direction of swing of a flexoelectrically‐driven CLC is electrically programmable. Combining a bimesogen and a CLC with an optimized helical pitch, the mixture enables a large flexoelastic ratio (e/K = 2.758 CN^‐1 m^‐1) and swinging amplitude of 53°. Furthermore, assisted by polymer stabilization the composite mixture offers many benefits of electro‐optical characteristics including fast response time (425 µs) and high optical contrast (500:1) between the field‐on and field‐off states as well as wavelength‐independent transmittance. The advances in the flexoelectro‐optical behavior of cholesteric metronomes open new avenues for applications in information displays, sensors and photonic devices.

中文翻译：

具有柔性电可编程幅度的胆甾型节拍器

使用软质材料执行器复制自然现象是材料科学家面临的主要挑战。例如，节拍器是一种在选定的间隔内产生可听见的节拍的设备。在各向异性的软质材料中，当施加的电场垂直于与基板垂直对齐的CLC螺旋时，柔性电驱动的胆甾型液晶（CLC）可以显示出节拍器般的摆动效果。柔性电动CLC的振幅和摆动方向是电可编程的。将双生素和CLC与优化的螺距结合在一起，该混合物可实现较大的挠弹性比（e / K = 2.758 CN ^-1 m ^-1），摆幅为53°。此外，在聚合物稳定化的辅助下，该复合混合物还具有许多电光特性，包括响应时间短（425 µs）和场开启和场关闭状态之间的高光学对比度（500：1）以及与波长无关的特性。透射率。胆甾型节拍器的柔性光电行为的进步为信息显示，传感器和光子设备的应用开辟了新途径。

更新日期：2018-04-10

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