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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2020-07-07
Measurement of the Local Intrinsic Curvature of a L = 1 Radio-Vortex at 30 GHz
By
Lorenzo Scalcinati,

    Dr. Lorenzo Scalcinati

    Dipartimento di Fisica

    Universitá degli Studi di Milano

    Italy

    Homepage

Bruno Paroli,

    Professor Bruno Paroli

    Dipartimento di Fisica

    Universitá degli Studi di Milano

    Italy

    Homepage

Mario Zannoni,

    Professor Mario Zannoni

    Physics Department

    University of Milano Bicocca

    Italy

    Homepage

Marco Alberto Carlo Potenza

    Professor Marco Alberto Carlo Potenza

    Dipartimento di Fisica

    Università degli Studi di Milano

    Italy

    Homepage

Progress In Electromagnetics Research M, Vol. 94, 1-8, 2020
doi:10.2528/PIERM20041407 | Google Scholar

Abstract
We exploit the properties of differential geometry of minimal surfaces to introduce a novel approach for characterizing wavefronts. Since Gaussian and mean curvatures describe global and local properties of any differentiable surface, a method for characterizing wavefronts endowed with non--trivial topological features has been introduced. We provide experimental evidence that the wavefront of an l = 1 radio-vortex at 30 GHz can be fully characterized by exploiting the wavefront phase in the far field of the source, accessing a small portion of the beam only. A particular care is dedicated to distinguish diffraction effects from the intrinsic curvature of the helicoidal wavefront. Results are applicable to the local measurement of the topological charge and to the local detection of orbital angular momentum radiation at the millimetric wavelengths.
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Citation
Lorenzo Scalcinati, Bruno Paroli, Mario Zannoni, and Marco Alberto Carlo Potenza, "Measurement of the Local Intrinsic Curvature of a L = 1 Radio-Vortex at 30 GHz ," Progress In Electromagnetics Research M, Vol. 94, 1-8, 2020.
doi:10.2528/PIERM20041407
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