Shape-induced force fields in optical trapping
Shape-induced force fields in optical trapping
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DOI：
10.1038/nphoton.2014.74
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发表时间：
2014-05-01
期刊：
影响因子：
35
通讯作者：
Simpson, S. H.
中科院分区：
文献类型：
--
作者：
Phillips, D. B.;Padgett, M. J.;Simpson, S. H.
光学镊子的进步，加上双光子聚合系统的扩散，意味着现在制造和捕获非球形粒子已经成为常规。光束和粒子的形状允许对从光学到机械的动量流进行精细控制。然而，与传统的光学捕获微球相比，理解和预测这种系统的行为是非常复杂的。在这篇文章中，我们提出了一个概念上新的和简单的方法，基于光力密度的性质。我们通过设计和制造一种能够作为被动力钳的形状粒子来说明这种方法，并演示了它作为成像表面形貌的光学捕获探针的用途。本文强调的设计规则的进一步应用可能会导致用于探测生物分子力学的新传感器，以及光驱动微机器的发展。
Advances in optical tweezers, coupled with the proliferation of two-photon polymerization systems, mean that it is now becoming routine to fabricate and trap non-spherical particles. The shaping of both light beams and particles allows fine control over the flow of momentum from the optical to mechanical regimes. However, understanding and predicting the behaviour of such systems is highly complex in comparison with the traditional optically trapped microsphere. In this Article, we present a conceptually new and simple approach based on the nature of the optical force density. We illustrate the method through the design and fabrication of a shaped particle capable of acting as a passive force clamp, and we demonstrate its use as an optically trapped probe for imaging surface topography. Further applications of the design rules highlighted here may lead to new sensors for probing biomolecule mechanics, as well as to the development of optically actuated micromachines.