Bhebhe Nkosiphile, Williams Peter A C, Rosales-Guzmán Carmelo, Rodriguez-Fajardo Valeria, Forbes Andrew
School of Physics, University of the Witwatersrand, Private Bag 3, Wits, 2050, South Africa.
Mechanical Engineering, Massachusetts Institute of Technology, 33 Massachusetts Ave, Cambridge, MA, 02139, USA.
Sci Rep. 2018 Nov 26;8(1):17387. doi: 10.1038/s41598-018-35889-0.
The invention of optical tweezers almost forty years ago has triggered applications spanning multiple disciplines and has also found its way into commercial products. A major breakthrough came with the invention of holographic optical tweezers (HOTs), allowing simultaneous manipulation of many particles, traditionally done with arrays of scalar beams. Here we demonstrate a vector HOT with arrays of digitally controlled Higher-Order Poincaré Sphere (HOPS) beams. We employ a simple set-up using a spatial light modulator and show that each beam in the array can be manipulated independently and set to an arbitrary HOPS state, including replicating traditional scalar beam HOTs. We demonstrate trapping and tweezing with customized arrays of HOPS beams comprising scalar orbital angular momentum and cylindrical vector beams, including radially and azimuthally polarized beams simultaneously in the same trap. Our approach is general enough to be easily extended to arbitrary vector beams, could be implemented with fast refresh rates and will be of interest to the structured light and optical manipulation communities alike.
大约四十年前发明的光镊引发了跨越多个学科的应用，并且也已进入商业产品领域。全息光镊（HOTs）的发明带来了一项重大突破，它允许同时操纵许多粒子，而传统上这是通过标量光束阵列来完成的。在此，我们展示了一种具有数字控制的高阶庞加莱球（HOPS）光束阵列的矢量全息光镊。我们采用了一种使用空间光调制器的简单设置，并表明阵列中的每束光都可以独立操纵并设置为任意的HOPS状态，包括复制传统的标量光束全息光镊。我们展示了使用包含标量轨道角动量和圆柱矢量光束（包括同时在同一陷阱中的径向和方位角偏振光束）的定制HOPS光束阵列进行捕获和镊取。我们的方法具有足够的通用性，能够轻松扩展到任意矢量光束，可以以快速刷新率实现，并且将受到结构光和光学操纵领域的共同关注。
