%0 Journal Article
%T Polarization singularities in near-field of Gaussian vortex beam diffracted by a circular aperture<br>
%A Li Jian-Long
%A <br>
%J 中国物理 B
%D 2010
%I 
%X 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.
%K polarization singularities
%K rigorous electromagnetic field theory
%K Gaussian vortex beams<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=CD8D6A6897B9334F09D8D1648C376FB4&aid=908FFF2AD8555FAF89542ADF7708BFA4&yid=140ECF96957D60B2&vid=2A8D03AD8076A2E3&iid=59906B3B2830C2C5&journal_id=1009-1963&journal_name=中国物理&referenced_num=0&reference_num=12