Giant light deflection via electro-mechanical modulation of liquid crystals
Giant light deflection via electro-mechanical modulation of liquid crystals
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DOI：
10.1063/1.5083980
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发表时间：
2019-02-11
影响因子：
4
通讯作者：
Ozaki, Masanori
中科院分区：
文献类型：
--
作者：
Imamura, Koki;Yoshida, Hiroyuki;Ozaki, Masanori
液晶（LC）是具有流动性和各向异性的物质，因其能够通过电压调制折射率而被用于各种电光器件。在这里，我们证明液晶能够通过机电方式调制光，从而在低电压下产生巨大的光偏转（1.0 V 时超过 64 度）。我们使用一种复合材料，其中显示光学布拉格反射的聚合胆甾液晶颗粒漂浮在向列液晶介质中。聚合物颗粒通过其表面分子锚定与主体导向器弹性耦合，并在弗雷德里克转变时从正面配置旋转到侧面配置。反射平面的刚体旋转会导致光偏转，这种偏转具有良好的重现性，并且可以在理论上进行建模。我们的研究结果证明了液晶作为微机电系统平台的能力，这对于大面积光控制应用具有潜在的用途。由 AIP Publishing 许可发布。
Liquid crystals (LCs) are matter with fluidity and anisotropy and have been used in various electro-optic devices for their capability to modulate the refractive index by voltage. Here, we show that LCs are capable of electro-mechanically modulating light to cause giant light deflection at low voltages (exceeding 64 degrees at 1.0 V). We use a composite material where polymerized cholesteric LC particles that show optical Bragg reflection float in a nematic LC medium. The polymer-particles are elastically coupled with the host director through their surface molecular anchoring and rotate from a face-on to side-on configuration at the Frederik transition. Rigid-body rotation of the reflection plane causes light deflection, which is well reproducible and can be modelled theoretically. Our findings demonstrate the capability of LCs as a micro-electrical-mechanical system platform, which are potentially useful for large-area light-controlling applications. Published under license by AIP Publishing.