利用偏振光场控制细胞运动和微尺度流动
Controlling cell motion and microscale flow with polarized light fields
摘要：
我们研究光偏振如何影响光响应藻类\textit{Euglena gracilis}的运动。在均匀极化的电场中，细胞近似垂直于极化方向游动，形成平均速度为零的极化状态。当光偏振在空间上变化时，细胞运动受到局部偏振的调制。在这样的光场，细胞表现出复杂的空间分布和运动模式，这是由底层领域的拓扑特性控制，我们进一步表明，有序的细胞游泳可以产生定向运输流体流。实验结果定量再现的主动布朗粒子模型中，粒子的运动方向是向列耦合到本地光偏振。
英文摘要：
We investigate how light polarization affects the motion of photo-responsive algae, \textit{Euglena gracilis}. In a uniformly polarized field, cells swim approximately perpendicular to the polarization direction and form a nematic state with zero mean velocity. When light polarization varies spatially, cell motion is modulated by local polarization. In such light fields, cells exhibit complex spatial distribution and motion patterns which are controlled by topological properties of the underlying fields; we further show that ordered cell swimming can generate directed transporting fluid flow. Experimental results are quantitatively reproduced by an active Brownian particle model in which particle motion direction is nematically coupled to local light polarization.
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