Angular momentum of the electromagnetic field: the plane wave paradox resolved

Details Angular momentum of the electromagnetic field: the plane wave paradox resolved Angular momentum of the electromagnetic field: the plane wave paradox resolved

2005-04-13

arxiv.org/abs/physics/0504082v3

European Journal of Physics Vol 26, 635-641 (2005)

Physics

Classical Physics

12 pages, 1 figure

Scientific paper

10.1088/0143-0807/26/4/008

The angular momentum of a classical electromagnetic plane wave of arbitrary extent is predicted to be, on theoretical grounds, exactly zero. However, finite sections of circularly polarized plane waves are found experimentally to carry angular momentum and it is known that the contribution to the angular momentum arises from the edges of the beam. A mathematical model is described that gives a quantitative account of this effect and resolves the paradox.

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