Dynamics of Fractional Vortex Beams at Fraunhofer Diffraction Zone

Fractional vortex beams (FVBs) possess unique topological properties that are manifested in the vortex distribution. However, there are still discrepancies in the value of the vortex strength of FVBs at the far field. In this work we present a complete picture of the behavior of the phase singularit...

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Bibliographic Details
Published inPhotonics Vol. 9; no. 7; p. 479
Main Authors Peters, Eduardo, Funes, Gustavo, Martínez-León, L., Tajahuerce, Enrique
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.07.2022
Subjects
Diffraction
Electron beams
Experimental methods
Integers
optical vortices
Phase transitions
Propagation
singular optics
spatial light modulators
Symmetry
Topology
Vortices
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Summary:Fractional vortex beams (FVBs) possess unique topological properties that are manifested in the vortex distribution. However, there are still discrepancies in the value of the vortex strength of FVBs at the far field. In this work we present a complete picture of the behavior of the phase singularities of non-integer (commonly known as fractional) beams in the Fraunhofer diffraction region and demonstrate a very good correspondence between experiments and simulations. As shown in the text, the original beam waist ω0 was found to be a key factor relating to the beam profile topology. This variable was measured in the process of calibrating the experiment. Finally, an experimental method to obtain the non-integer topological charge is proposed. This method only requires an analysis of the intensity, knowledge of the transition behaviors, and the beam waist.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics9070479