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Transverse angular momentum and transverse barycenter shift of a focused light field due to nonuniform input angular momentum

机译:输入角动量不均匀导致聚焦光场的横向角动量和横向重心偏移

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摘要

We calculate the spin, intrinsic and extrinsic orbital angular momenta, as well as the barycenter of the focal field after a high-NA lens and find that, when the input beam is with nonuniform angular momentum (AM), the focal field carries both longitudinal and transverse parts of AM and the barycenter of the field has a transverse shift owing to the spin and orbital Hall effect of light. When one half of the input beam possesses spin and orbital AM, σ and l, and the other half with -σ and -l, a pure transverse AM is generated in the focal field, accompanying a shift of the field barycenter in the transverse plane that depends on σ and l.
机译:我们计算了自旋,内在和外在的轨道角动量,以及高NA透镜后焦点场的重心,发现当输入光束具有不均匀的角动量(AM)时,焦点场在纵向由于光的自旋和轨道霍尔效应,AM的横向部分和场的重心发生横向偏移。当输入光束的一半具有自旋和轨道AM,σ和l且另一半具有-σ和-l时,伴随着场重心在横向平面中的移动,在焦场中会生成纯的横向AM。取决于σ和l。

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