Study of the birth of a vortex at Fraunhofer zone

We analytically and experimentally study the Fraunhofer diffraction of an optical vortex beam possessing noninteger values of the azimuthal index. We show that the Fraunhofer diffraction of this beam presents the birth of a vortex at α=n+ε, where n is an integer number and ε is a small fraction. We...

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Bibliographic Details
Published in:Optics letters 2012-11, Vol.37 (21), p.4552-4554
Main Authors: Jesus-Silva, Alcenisio J, Fonseca, Eduardo J S, Hickmann, Jandir M
Format: Article
Language:English
Subjects:
Beams (radiation)
Birth
Diffraction
Fluid flow
Integers
Mathematical analysis
Movement
Vortices
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Summary:We analytically and experimentally study the Fraunhofer diffraction of an optical vortex beam possessing noninteger values of the azimuthal index. We show that the Fraunhofer diffraction of this beam presents the birth of a vortex at α=n+ε, where n is an integer number and ε is a small fraction. We discuss this behavior on the basis of the born vortex movement from a position of low intensity to high intensity when α is increased of an integer number in fractional steps of ε.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.37.004552