Abstract Polarization singularities in the near-field of Gaussian vortex beams diffracted by a circular aperture are studied by a rigorous electromagnetic theory. It is shown that there exist C-points and L-lines, which depend on off-axis displacement parameters along the x and y directions, waist width, wavelength, and topological charge of the diffracted Gaussian vortex beam, as well as on propagation distance. The results are illustrated by numerical calculations.
(Beam characteristics: profile, intensity, and power; spatial pattern formation)
Fund: Project supported by the China Postdoctoral Science Foundation (Grant No. 2009450159), and the Foundation of the State Key Laboratory of Optical Technologies for Micro-Frabrication and Micro-Engineering, Chinese Academy of Sciences (Grant No. KF001).
Cite this article:
Li Jian-Long(李建龙) Polarization singularities in near-field of Gaussian vortex beam diffracted by a circular aperture 2010 Chin. Phys. B 19 124001
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