Experimental evidence for new symmetry axis of electromagnetic beams

摘要

The new symmetry axis of a well-behaved electromagnetic beam advanced inpaper Physical Review A 78, 063831 (2008) is not purely a mathematical concept.The experimental result reported by Hosten and Kwiat in paper Science 319, 787(2008) is shown to demonstrate the existence of this symmetry axis that isneither perpendicular nor parallel to the propagation axis.