Formation of Millimeter Waves with Electrically Tunable Orbital Angular Momentum

A method for forming electromagnetic waves with a tunable nonzero orbital angular momentum (OAM) is proposed. The approach is based on transforming an incident plane wave into a helical one using an electrically tunable ferroelectric lens. It uses high-resistive thin/thick film electrodes with a spe...

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Bibliographic Details
Published in:Coatings (Basel) 2021-05, Vol.11 (5), p.569
Main Authors: Altynnikov, Andrey, Platonov, Roman, Tumarkin, Andrey, Petrov, Peter K., Kozyrev, Andrey
Format: Article
Language:English
Subjects:
Angular momentum
Aperture
Electric fields
Electrodes
Electromagnetic radiation
Ferroelectric materials
Ferroelectricity
Lenses
Millimeter waves
Phase distribution
Plane waves
Prototypes
Radiation
Topology
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Summary:A method for forming electromagnetic waves with a tunable nonzero orbital angular momentum (OAM) is proposed. The approach is based on transforming an incident plane wave into a helical one using an electrically tunable ferroelectric lens. It uses high-resistive thin/thick film electrodes with a special discrete topology. The correlation between film electrodes topology and the highest order of OAM modes that the lens can form is described. A lens prototype based on Ba0.55Sr0.45TiO3 ferroelectric material and operating at a frequency of 60 GHz was designed, manufactured, and tested. The amplitude and phase distribution of the OAM wave with l = +1 formed by prototype were measured to confirm the effectiveness of the proposed method. The proposed lens has a combination of advantages such as low dimensions, electrical control over the OAM modes, and the possibility to operate in the millimeter wavelength range.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings11050569