Journal
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
Volume 6, Issue 5, Pages S202-S208Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1464-4258/6/5/011
Keywords
phase singularity; optical vortex; screw dislocation; topology
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Generic wave dislocations (phase singularities, optical vortices) in three dimensions have anisotropic local structure, which is analysed, with emphasis on the twist of surfaces of equal phase along the singular line, and the rotation of the local anisotropy ellipse (twirl). Various measures of twist and twirl are compared in specific examples, and a theorem is found relating the (quantized) topological twist and twirl for a closed dislocation loop with the anisotropy C line index threading the loop.
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