The arxiv paper quoted therein: http://arxiv.org/pdf/1101.6015v1.pdf http://arxiv.org/pdf/1101.6015v1.pdf I, for one, think this is neat stuff. (Practicality

The arxiv paper quoted therein: http://arxiv.org/pdf/1101.6015v1.pdf http://arxiv.org/pdf/1101.6015v1.pdf I, for one, think this is neat stuff. (Practicality might well be a different matter.) Poynting himself mentioned the angular momentum present -- From the arxiv paper: Poynting, J. H. The wave motion of a revolving shaft, and a suggestion as to the angular momentum in a beam of circularly polarised light. Proc. Roy. Soc. London A 82, 560–567 (1909). The presence of "suggestion" in the title is also interesting. Wish I had time to dig through this history.