Abstract
We describe observer-dependent sign inversions of the topological charges of vector field polarization singularities: points (points of circular polarization), points (points of linear polarization), and two virtually unknown singularities we call and points. In all cases, the sign of the charge seen by an observer can change as she changes the direction from which she views the singularity. Analytic formulas are given for all and all point sign inversions.
© 2014 Optical Society of America
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