没有轨道angular momentum的轨道旋转：内能流自旋部分的机械action
Orbital rotation without orbital angular momentum: mechanical action of the spin part of the internal energy flow
摘要：
众所周知，光束中的内能流可以分为与光束内的宏观能量重新分布相关联的轨道流和源自圆或椭圆偏振中固有的场矢量的瞬时旋转的自旋流。与轨道流相比，自旋流成分的实验观察似乎存在问题，因为（i）它本身并不表现在光束轮廓的可见变换中，以及（ii）它在光束紧密聚焦时转换为轨道流，通常用于通过对探针粒子的机械作用进行能流检测。我们提出了一种双光束干涉技术，允许获得可观的水平的自旋流在适度集中的光束，并检测探测粒子的轨道运动在一个字段中的横向能量循环是专门与自旋流。这一结果可以看作是光场的自旋流的机械作用的第一个证明。
英文摘要：
It is known that internal energy flow in a light beam can be divided into the orbital flow, associated with the macroscopic energy redistribution within the beam, and the spin flow originating from instantaneous rotation of the field vectors inherent in circular or elliptic polarization. In contrast to the orbital one, experimental observation of the spin flow constituent seemed problematic because (i) it does not manifest itself in the visible transformation of the beam profile and (ii) it converts into the orbital flow upon tight focusing of the beam, usually employed for the energy flow detection by the mechanical action on probe particles. We propose a two-beam interference technique that permits to obtain appreciable level of the spin flow in moderately focused beams and to detect the orbital motion of probe particles within a field where the transverse energy circulation is associated exclusively with the spin flow. This result can be treated as the first demonstration of mechanical action of the spin flow of a light field.
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