4.6 Article

Formation of Millimeter Waves with Electrically Tunable Orbital Angular Momentum

Journal

COATINGS
Volume 11, Issue 5, Pages -

Publisher

MDPI
DOI: 10.3390/coatings11050569

Keywords

orbital angular momentum; millimeter waves; ferroelectric; films; electrically tunable

Funding

  1. Russian Science Foundation [18-79-10156]
  2. Henry Royce Institute through EPSRC [EP/R00661X/1]
  3. Russian Science Foundation [18-79-10156] Funding Source: Russian Science Foundation

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The proposed method utilizes an electrically tunable ferroelectric lens to transform an incident plane wave into a helical one, forming electromagnetic waves with a tunable nonzero orbital angular momentum (OAM). It uses high-resistive thin/thick film electrodes and describes the correlation between film electrodes topology and the highest order of OAM modes that the lens can form.
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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