Journal
OPTICS COMMUNICATIONS
Volume 272, Issue 1, Pages 1-8Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2006.11.004
Keywords
phase singularity; high numerical (NA) dark-hollow Gaussian beam; vectorial Debye diffraction theory
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By using the vectorial Debye diffraction theory, phase singularities of high numerical aperture (NA) dark-hollow Gaussian beams in the focal region are studied. The dependence of phase singularities on the truncation parameter delta and semi'-aperture angle alpha (or equally, NA) is illustrated numerically. A comparison of phase singularities of high NA dark-hollow Gaussian beams with those of scalar paraxial Gaussian beams and high NA Gaussian beams is made. For high NA dark-hollow Gaussian beams the beam order n additionally affects the spatial distribution of phase singularities, and there exist phase singularities outside the focal plane, which may be created or annihilated by variation of the semi-aperture angle in a certain region. (c) 2006 Elsevier B.V. All rights reserved.
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