Open AccessEvolution of an optical vortex dipole diffracted by a half screen
Author(s) -
Zenghui Gao,
Duanwei He,
Lü Bai-Da
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.074209
Subject(s) - diffraction , dipole , physics , annihilation , optics , optical vortex , vortex , time evolution , displacement (psychology) , beam (structure) , gaussian , quantum mechanics , psychology , psychotherapist , thermodynamics
The analytical expression for the propagation of an optical vortex dipole (OVD) nested in a Gaussian beam diffracted by a half screen is derived and used to study the evolution of the diffracted OVD. It is shown that Compared with the case of the OVD evolution in free space, multi-pairs of the OVD may take place in the diffracted field, and the annihilation fashion depends on the off-axis displacement. A variety of the evolution behaviors of OVDs appear by varying the off-axis parameter, but the topological charge is conserved in the evolution process.