Direct Measurement of the Topological Charge in Elliptical Beams Using Diffraction by a Triangular Aperture

We introduce a simple method to characterize the topological charge associated with the orbital angular momentum of a m-order elliptic light beam. This method consists in the observation of the far field pattern of the beam carrying orbital angular momentum, diffracted from a triangular aperture. We...

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Bibliographic Details
Published in:Scientific reports 2018-04, Vol.8 (1), p.6370-8, Article 6370
Main Authors: Melo, Leandro A., Jesus-Silva, Alcenísio J., Chávez-Cerda, Sabino, Ribeiro, Paulo H. Souto, Soares, Willamys C.
Format: Article
Language:English
Subjects:
639/624/400
639/766/400
Humanities and Social Sciences
multidisciplinary
Science
Science (multidisciplinary)
Vortices
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Summary:We introduce a simple method to characterize the topological charge associated with the orbital angular momentum of a m-order elliptic light beam. This method consists in the observation of the far field pattern of the beam carrying orbital angular momentum, diffracted from a triangular aperture. We show numerically and experimentally, for Mathieu, Ince–Gaussian, and vortex Hermite–Gaussian beams, that only isosceles triangular apertures allow us to determine in a precise and direct way, the magnitude m of the order and the number and sign of unitary topological charges of isolated vortices inside the core of these beams.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-018-24928-5