论文标题
通过光学陷阱拉动实验探测的几个体体流体动力相互作用
Few-body hydrodynamic interactions probed by optical trap pulling experiment
论文作者
论文摘要
我们研究放置在双光学陷阱设置中的相邻微珠的流体动力耦合，使我们能够精确控制耦合的程度，并直接测量夹带珠的时间依赖性轨迹。将相邻扫描珠的运动所包含的探针珠的平均实验轨迹与理论计算进行了比较，这说明了粘性耦合和设定时间表在探针珠弛豫中的作用。这些发现提供了与水动力辅助胶体组件相关的较大的微米空间尺度和毫秒时尺度的水动力耦合的直接实验佐证，并改善了光学镊子的分辨率。我们重复三个珠子设置的实验。
We study the hydrodynamic coupling of neighboring micro-beads placed in a dual optical trap setup allowing us to precisely control the degree of coupling and directly measure time-dependent trajectories of the entrained beads. Average experimental trajectories of a probe bead entrained by the motion of a neighboring scan bead are compared with theoretical computation, illustrating the role of viscous coupling and setting timescales for probe bead relaxation. The findings provide direct experimental corroborations of hydrodynamic coupling at larger, micron spatial scales and millisecond timescales, of relevance to hydrodynamic-assisted colloidal assembly as well as improving the resolution of optical tweezers. We repeat the experiments for three bead setups.
