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arXiv 1102.4905physics.opticsphysics.comp-ph
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前伸梁的后拉力

Backward Pulling Force from a Forward Propagating Beam

Jun Chen, Jack Ng, Zhifang Lin, C. T. Chan

摘要:

光子的动量为,所以人们可以预期光会通过散射力“推”任何站在其路径上的物体。在没有强度梯度的情况下,使用光束将粒子向后拉是违反直觉的。在这里,我们表明,这是可能实现的向后散射力,拉一个粒子所有的方式对源没有平衡点。其基本物理原理是通过辐射多极干涉使前向散射最大化。我们明确地表明,实现负(拉)的光学力的必要条件是在粒子中的多极子的同时激发,如果沿传播方向的总光子动量的投影是小的(如在一些传播不变的光束),吸引力的光学力是可能的。这种可能性增加了“拉”作为一个额外的自由度,光学显微操作。

英文摘要:

A photon carries a momentum of, so one may anticipate light to "push" on any object standing in its path via the scattering force. In the absence of intensity gradient, using a light beam to pull a particle backwards is counter intuitive. Here, we show that it is possible to realize a backward scattering force which pulls a particle all the way towards the source without an equilibrium point. The underlining physics is the maximization of forward scattering via interference of the radiation multipoles. We show explicitly that the necessary condition to realize a negative (pulling) optical force is the simultaneous excitation of multipoles in the particle and if the projection of the total photon momentum along the propagation direction is small (as in some propagation invariant beams), attractive optical force is possible. This possibility adds "pulling" as an additional degree of freedom to optical micromanipulation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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