Opt Lett. 2013 Nov 15;38(22):4919-22. doi: 10.1364/OL.38.004919.
We analyze microparticle dynamics within a "perfect" vortex beam. In contrast to other vortex fields, for any given integer value of the topological charge, a "perfect" vortex beam has the same annular intensity profile with fixed radius of peak intensity. For a given topological charge, the field possesses a well-defined orbital angular momentum density at each point in space, invariant with respect to azimuthal position. We experimentally create a perfect vortex and correct the field in situ, to trap and set in motion trapped microscopic particles. For a given topological charge, a single trapped particle exhibits the same local angular velocity moving in such a field independent of its azimuthal position. We also investigate particle dynamics in "perfect" vortex beams of fractional topological charge. This light field may be applied for novel studies in optical trapping of particles, atoms, and quantum gases.
我们分析了“完美”涡旋光束中的微粒子动力学。与其他涡旋场不同，对于给定的拓扑电荷的整数，“完美”涡旋光束具有相同的环形强度分布，其峰值强度的半径固定。对于给定的拓扑电荷，该场在空间中的每一点都具有明确定义的轨道角动量密度，与方位角位置无关。我们实验创建了一个完美的涡旋，并在现场进行了修正，以捕获和移动被困的微观粒子。对于给定的拓扑电荷，单个被捕获的粒子在这种场中表现出相同的局部角速度，而与它的方位角位置无关。我们还研究了分数拓扑电荷的“完美”涡旋光束中的粒子动力学。这种光场可应用于粒子、原子和量子气体的光阱的新研究。
