The Orbital Angular Momentum of Light: An Introduction
The Orbital Angular Momentum of Light: An Introduction
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DOI：
10.1002/9783527635368.ch1
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发表时间：
2011-03
期刊：
影响因子：
--
通讯作者：
L. Allen;M. Padgett
中科院分区：
文献类型：
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作者：
L. Allen;M. Padgett
大多数物理学家都知道偏振光与光子的自旋角动量有关。几乎可以肯定的是，轨道角动量的概念还很不为人所知。也许最简单和最明显的显示自旋和轨道角动量的光束来自检查他们的角动量比他们的能量。对于理想化的圆偏振平面波，自旋角动量由Jz = Nh <$ω给出，能量由W = Nh <$ω给出，其中N是光子数。角动量与能量之比是，
Most physicists know that polarized light is associated with the spin angular momentum of the photon. It is almost certainly true that the idea of orbital angular momentum is a good deal less understood. Perhaps the simplest and most obvious display of both the spin and orbital angular momentum of light beams comes from an examination of the ratio of their angular momentum to their energy. For an idealized, circularly-polarized plane wave, the spin angular momentum is given by Jz = Nh̄ and the energy by W = Nh̄ω, where N is the number of photons. The angular momentum to energy ratio is thus,