Force on a scatterer in counter-propagating coherent beams
Force on a scatterer in counter-propagating coherent beams
复制标题
对向传播相干光束中散射体上的力
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Lekner
中科院分区：
文献类型：
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作者：
J. Lekner
反向传播的相干光束产生条纹，在平面波的情况下，条纹的强度与Cos2kz成正比。放置在边缘场中的散射体会受到力，除非中心位于强度最大或最小的位置。我们证明，对于强度极大值的位移b，力是sin2kb乘以力系数。力因子与b无关，取决于球面散射体与a(单向)平面波的相互作用。这一结果对球面散射体是普遍适用的，在量子粒子和电磁情况下都适用。对于给定类型的散射体，力因子以振荡的方式依赖于散射体大小与波长的比率，因此对于不同的半径/波长值，散射体可能在强度极大值或强度极小值处于稳定平衡，甚至可能完全感觉不到力。
Counter-propagating coherent beams produce fringes, with intensity proportional to cos2kz in the plane wave case. A scatterer placed in the fringing field experiences a force, except when centred on an intensity maximum or minimum. We show that, for displacement b from an intensity maximum, the force is sin2kb times a force factor. The force factor is independent of b, and depends on the interaction of the spherical scatterer with a (unidirectional) plane wave. This result is universal for spherical scatterers, and holds in both the quantum particle and electromagnetic cases. For a given type of scatterer, the force factor depends on the ratio of scatterer size to wavelength in an oscillatory way, so for different radius/wavelength values the scatterer may be in stable equilibrium at intensity maxima or at intensity minima, or may even not feel a force at all.