圆偏振光束的角动量。
Angular momentum of a circularly polarized light beam.
作者信息
Khrapko R I
机构信息
Moscow Aviation Institute National Research University, Russia.
出版信息
Heliyon. 2024 Sep 19;10(19):e37993. doi: 10.1016/j.heliyon.2024.e37993. eCollection 2024 Oct 15.
It is shown that the Maxwell electrodynamics cannot explain the existence of an angular momentum flux in a circularly polarized light beam which has no the phase structure. The fact is that such a beam contains a small rotating electromagnetic mass and, accordingly, contains an angular momentum directed along the beam axis, but this rotating mass has no speed in the direction of the beam axis. Therefore, this angular momentum is not transferred along the beam axis, and there is no flow of this angular momentum along the beam axis. We show the angular momentum flux in such a beam is contained in the main mass of the beam, which does not rotate. This angular momentum flux is a spin flux and is described by the spin tensor. Likewise, taking spin into account is required to explain the classical Beth experiment and other experiments.
结果表明，麦克斯韦电动力学无法解释无相位结构的圆偏振光束中角动量通量的存在。事实上，这样的光束包含一个小的旋转电磁质量，因此包含一个沿光束轴方向的角动量，但这个旋转质量在光束轴方向上没有速度。所以，这个角动量不会沿光束轴传递，并且不存在沿光束轴的这种角动量流。我们表明，这种光束中的角动量通量包含在光束的主体质量中，该主体质量并不旋转。这种角动量通量是一种自旋通量，由自旋张量描述。同样，为了解释经典的贝思实验和其他实验，需要考虑自旋。
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