Change in collective motion of colloidal particles driven by an optical vortex with driving force and spatial confinement†,Soft Matter

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Change in collective motion of colloidal particles driven by an optical vortex with driving force and spatial confinement†
Soft Matter ( IF 2.9 ) Pub Date : 2018-06-28 00:00:00 , DOI: 10.1039/c8sm00582f
Keita Saito _{1,

2,

3,

4,

5} , Shogo Okubo _{1,

2,

3,

4,

5} , Yasuyuki Kimura _{1,

2,

3,

4,

5}

Affiliation

We studied the change in collective behavior of optically driven colloidal particles on a circular path. The particles are simultaneously driven by the orbital angular momentum of an optical vortex beam generated by holographic optical tweezers. The driving force is controlled by the topological charge l of the vortex. By varying the driving force and spatial confinement, four characteristic collective motions were observed. The collective behavior results from the interplay between the optical interaction, hydrodynamic interaction and spatial confinement. Varying the topological charge of an optical vortex not only induces changes in driving force but also alters the stability of three-dimensional optical trapping. The switch between dynamic clustering and stable clustering was observed in this manner. Decreasing the cell thickness diminishes the velocity of the respective particles and increases the spatial confinement. A jamming-like characteristic collective motion appears when the thickness is small and the topological charge is large. In this regime, a ring of equally-spaced doublets was spontaneously formed in systems composed of an even number of particles.

中文翻译：

由光学涡旋带动的胶体粒子集体运动随驱动力和空间限制而变化†

我们研究了光驱动胶体颗粒在圆形路径上的集体行为的变化。全息光学镊子产生的光学涡旋光束的轨道角动量同时驱动粒子。驱动力由拓扑电荷l控制的漩涡。通过改变驱动力和空间限制，观察到四个特征性的集体运动。集体行为是由光学相互作用，流体动力学相互作用和空间限制之间的相互作用产生的。改变光学涡旋的拓扑电荷不仅会引起驱动力的变化，还会改变三维光学陷阱的稳定性。以这种方式观察到动态聚类和稳定聚类之间的切换。减小孔的厚度会减小各个粒子的速度，并会增加空间限制。当厚度较小且拓扑电荷较大时，会出现类似卡纸的特征集体运动。在这种制度下

更新日期：2018-06-28

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