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Formation of millimeter waves with electrically tunable orbital angular momentum

Authors
  • Petrov, P
  • Altynnikov, A
  • Platonov, R
  • Tumarkin, A
  • Kozyrev, A
Publication Date
May 05, 2021
Source
UPCommons. Portal del coneixement obert de la UPC
Keywords
License
Green
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Abstract

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.

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