The appearance of a surface term in the expression of the spin angular momentum for light beams is proven by direct calculation from Maxwell's equation via the angular spectrum representation. Two examples are given.
© 2012 OSA
M. Ornigotti and A. Aiello, "Surface Spin Angular Momentum for LIght Beams," in Frontiers in Optics 2012/Laser Science XXVIII, OSA Technical Digest (online) (Optical Society of America, 2012), paper FW3A.5.
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