Comment on "Geometric absorption of electromagnetic angular momentum", C. Konz, G. Benford

Details Comment on "Geometric absorption of electromagnetic angular momentum", C. Konz, G. Benford Comment on "Geometric absorption of electromagnetic angular momentum", C. Konz, G. Benford

2004-02-10

arxiv.org/abs/physics/0402046v2

Optics Communications 235, 227-229 (2004)

Physics

Optics

5 pages. Version 2 includes journal reference info

Scientific paper

10.1016/j.optcom.2004.02.066

The core theorem on which the above paper is centred - that a perfectly conducting body of revolution absorbs no angular momentum from an axisymmetric electromagnetic wave field - is in fact a special case of a more general result in electromagnetic scattering theory. In addition, the scaling of the efficiency of transfer of angular momentum to an object with the wavelength and object size merits further discussion. Finally, some comments are made on the choice of terminology and the erroneous statement that a circularly polarized plane wave does not carry angular momentum.

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