Correlated motions of two hydrodynamically coupled particles confined in separate quadratic potential wells
Correlated motions of two hydrodynamically coupled particles confined in separate quadratic potential wells
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DOI：
10.1103/physreve.65.021906
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发表时间：
2002-02-01
影响因子：
2.4
通讯作者：
Ou-Yang, HD
中科院分区：
文献类型：
--
作者：
Hough, LA;Ou-Yang, HD
我们报告了对两个流体动力学耦合的胶体颗粒的相关运动的研究，每个胶体颗粒都被困在由光镊（光陷阱）定义的二次势阱中。通过使用振荡光镊将其中一个捕获的粒子设置为强制振荡，我们测量了每个粒子在宽频率范围内的位移和相移。根据陷阱中两个粒子的同相和异相运动，我们确定耦合机械系统的相关运动作为频率的函数。开发了一个理论模型来计算耦合机械系统的响应张量。实验结果与理论模型的预测相符。该方法可以扩展到更一般的应用，例如粘弹性和/或异质介质的微观机械特性的研究。
We report a study of the correlated motions of two hydrodynamically coupled colloidal particles, each of which is trapped in a quadratic potential well defined by optical tweezers (optical traps). By setting one of the trapped particles into forced oscillation using oscillating optical tweezers, we measure the displacement and phase shift of each of the particles over a wide frequency range. From the in-phase and out-of-phase motions of both of the particles in the traps, we determine the correlated motions of the coupled mechanical system as a function of frequency. A theoretical model is developed to calculate the response tensor of the coupled mechanical system. The experimental results are in agreement with the prediction of the theoretical model. This method may be extended to more general applications, such as the investigation of the micromechanical properties of viscoelastic and/or heterogeneous media.