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arXiv 0908.4504physics.optics
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涡旋光束光阱的严格理论

Rigorous Theory of Optical Trapping by an Optical Vortex Beam

Jack Ng, Zhifang Lin, C. T. Chan

发表信息：
Phys Rev Letters 104, 103601 (2010)
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摘要：

我们提出了一个严格的理论，光学涡旋的光捕获，这是一个新兴的重要工具，以捕获介观粒子。一般认为，捕获作用完全是由于梯度力引起的，并且可以用三个实力常数来表征。然而，我们表明，光学涡旋陷阱可以表现出复杂的力常数，这意味着捕获必须稳定的环境阻尼。在不同的阻尼水平下，粒子表现出明显不同的动力学行为，如稳定捕获、周期和非周期轨道运动。

英文摘要：

We propose a rigorous theory for the optical trapping by optical vortices, which is emerging as an important tool to trap mesoscopic particles. The common perception is that the trapping is solely due to the gradient force, and may be characterized by three real force constants. However, we show that the optical vortex trap can exhibit complex force constants, implying that the trapping must be stabilized by ambient damping. At different damping levels, particle shows remarkably different dynamics, such as stable trapping, periodic and aperiodic orbital motions.

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