全息验证的多维光学分离
Multidimensional optical fractionation with holographic verification
摘要：
胶体粒子在周期性势能场中运动的轨迹，可以被动力学地锁定在由势能场对称性决定的方向上。当景观是由一个结构化的光场施加的力来实现的时候，一个给定的粒子所遵循的路径已经被预测为非常敏感地依赖于粒子的大小和折射率等属性。在这里，我们描述了通过全息光学陷阱阵列的胶态二氧化硅球体的运输测量，这些全息光学陷阱使用全息视频显微镜来跟踪各个球体在三维中的运动，并同时以千分之一的分辨率测量每个球体的半径和折射率。这些测量结果证实了以前未经测试的预测阈值的动力学锁定运输，并证明了光学分馏的能力，排序胶体球的千分之一的分辨率上的多个特性同时进行。
英文摘要：
The trajectories of colloidal particles driven through a periodic potential energy landscape can become kinetically locked in to directions dictated by the landscape's symmetries. When the landscape is realized with forces exerted by a structured light field, the path a given particle follows has been predicted to depend exquisitely sensitively on such properties as the particle's size and refractive index These predictions, however, have not been tested experimentally. Here, we describe measurements of colloidal silica spheres' transport through arrays of holographic optical traps that use holographic video microscopy to track individual spheres' motions in three dimensions and simultaneously to measure each sphere's radius and refractive index with part-per-thousand resolution. These measurements confirm previously untested predictions for the threshold of kinetically locked-in transport, and demonstrate the ability of optical fractionation to sort colloidal spheres with part-per-thousand resolution on multiple characteristics simultaneously.
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