Optically driven liquid crystal rotator
Optically driven liquid crystal rotator
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光驱动液晶旋转器
DOI：
10.1117/12.2658782
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Keita Saito and Yasuyuki Kimura
中科院分区：
文献类型：
--
作者：
末松J.信彦;池田幸太、西森拓;降籏 大介;Keita Saito and Yasuyuki Kimura
实验研究了向列型液晶液滴在聚焦圆偏振光照射下的旋转。传递给液滴的光扭矩取决于液滴的大小。讨论了液滴内LC分子排列与转动机理之间的关系。在较大的液滴中，内部LC排列是双极性的，波片行为成为主导。在较小的液滴中，光学各向异性随液滴尺寸的减小而减小，散射过程是其旋转的主要原因。我们还利用全息光镊构造了多LC旋转器系统。这种光可控涡旋使我们能够实现微米尺度的复杂流场。
Rotation of nematic liquid crystal (NLC) droplets by irradiation of focused circular polarized light is experimentally studied. Optical torque transferred to a droplet depends on its size. We discuss the relation between the LC molecular alignment inside the droplet and its rotation mechanism. In a larger droplet, the internal LC alignment is bipolar and wave-plate behavior becomes dominant. In a smaller droplet, the optical anisotropy reduces with decrease of its size and scattering process mainly contributes its rotation. We also construct multiple LC rotators system using a holographic optical tweezer. Such optically controllable vortex enables us to realize complex flow field at micron-scale.