On the Topological Robustness of Vortex Modes at Microwave Frequencies
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Date
2019-09
Authors
Barbuto, Mirko
Bassotti, Andrea
Alu, Andrea
Bilotti, Filiberto
Toscano, Alessandro
ORCID
Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
Společnost pro radioelektronické inženýrství
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Abstract
Vortex fields carrying orbital angular momentum are robust with respect to a wide range of external disturbances and exhibit self-healing properties. These peculiar characteristics have been deeply investigated at optical frequencies but only a few of them have been observed at microwaves. In this paper, we try to partially fill this gap by investigating the topological characteristics of vortex fields radiated by standard patch antennas. In particular, we describe the behavior of a vortex mode when a metallic screen is placed in the near field of the radiating patch. Through a proper set of full-wave numerical simulations, we show that the main characteristics of the vortex mode, i.e. the spiral phase profile and the amplitude null, are preserved even if the overall radiated field is strongly perturbed by the obstacle.
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Citation
Radioengineering. 2019 vol. 28, č. 3, s. 499-504. ISSN 1210-2512
https://www.radioeng.cz/fulltexts/2019/19_03_0499_0504.pdf
https://www.radioeng.cz/fulltexts/2019/19_03_0499_0504.pdf
Document type
Peer-reviewed
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Published version
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Language of document
en