Superperiodic Liquid-Crystal Metasurfaces for Electrically Controlled Anomalous Refraction,ACS Photonics

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Superperiodic Liquid-Crystal Metasurfaces for Electrically Controlled Anomalous Refraction
ACS Photonics ( IF 6.5 ) Pub Date : 2020-10-20 , DOI: 10.1021/acsphotonics.0c01168
Maxim V. Gorkunov _{1,

2} , Irina V. Kasyanova ₁ , Vladimir V. Artemov ₁ , Alexander A. Ezhov _{1,

3,

4,

5} , Alena V. Mamonova ₁ , Ivan V. Simdyankin ₁ , S. P. Palto ₁

Affiliation

Optical liquid-crystal metasurfaces self-assemble on polymer layers locally processed with a digitally controlled focused ion beam. We expand their functionality by introducing superperiodic design consisting of parallel stripes of various widths inducing different liquid crystal alignment. We optimize the design to achieve strongly asymmetric light diffraction effectively resulting in efficient anomalous refraction. By implementing the optimal patterns of different periodicity, assembling a liquid crystal cell, and assessing its diffractive properties, we experimentally confirm the deflection of normally incident light into a particular oblique direction with 60% efficiency. Applying AC voltage of several volts amplitude across the liquid crystal reversibly straightens its orientation, suppresses the refraction, and reroutes light into the direct transmission. Time-resolved measurements reveal that the switching between refracting and transmitting states occurs within a few milliseconds in both directions.

中文翻译：

电控异常折射的超周期液晶超表面

光学液晶超表面在由数控聚焦离子束局部处理的聚合物层上自组装。我们通过引入超周期设计来扩展其功能，超周期设计由各种宽度的平行条纹引起不同的液晶排列。我们优化设计以实现强烈的非对称光衍射，从而有效地产生有效的异常折射。通过实现不同周期性的最佳模式，组装液晶单元并评估其衍射特性，我们实验确定了法向入射光向特定倾斜方向的偏转效率为60％。在液晶上施加几伏振幅的交流电压可逆地拉直其方向，抑制折射，并将光重新路由到直接传输中。时间分辨的测量结果表明，折射和透射状态之间的切换在两个方向上都在几毫秒内发生。

更新日期：2020-11-18

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