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本文利用自旋-动量关系表征了柱矢量涡旋光束(cylindrical vector vortex beam, CVVB)在自由空间中传输时的动量(P)、自旋角动量(spin angular momentum, SAM)、横向自旋角动量(t-SAM)、纵向自旋角动量(l-SAM)、轨道角动量(orbital angular momentum, OAM)以及矢量光场分布 ． 研究结果表明：P存在与光轴平行和垂直的分量，t-SAM、l-SAM和光场在拓扑荷m不为零时均存在与光轴平行和垂直的分量，而SAM只存在与光轴垂直的分量，不存在与光轴平行的分量 ． 使用自旋-动量关系，对在自由空间中传输的柱矢量涡旋光束的光学参量进行全矢量的表征，可以为分析结构光束在不同介质中传输时的角动量特性提供一定的理论基础。The full vector property of the optical parameter of cylindrical vector vortex beam (CVVB) in free space was characterized using the spin-momentum relation, including the momentum (P), spin angular momentum (SAM), transverse-type spin angular momentum (t-SAM), longitudinal-type spin angular momentum (l-SAM) and light field . P has x, y and z components . SAM has x and y components, but no z component. t-SAM and l-SAM all have components which are parallel and perpendicular to the optical axis when the topological charge m is not 0. t-SAM has a longitudinal component which is related to the helical trajectory of photons and l-SAM has a transverse component in free space. Except for the APVB, which has no longitudinal field when the topological charge m is 0, both RPVB and APVB have longitudinal fields in free space. The vectorial characteristic of the angular momentum of CVVB in free space can provide a theoretical basis for analyzing the transmission of structured beams in different media.
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Keywords:
- cylindrical vector vortex beam /
- kinetic momentum /
- spin angular momentum /
- orbital angular momentum
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