Dielectric tunability of ferroelectric barium titanate at millimeter-wave frequencies

Charlotte Cochard, Thiemo Spielmann, and Torsten Granzow
Phys. Rev. B 100, 184104 – Published 8 November 2019
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Abstract

Ferroelectrics have been rarely considered as suitable candidates for the design of agile devices in the booming field of millimeter wavelengths and terahertz applications. Here a specifically designed free-space quasioptical system to determine the dielectric tunability and losses of a barium titanate single crystal at different temperatures is described. The values obtained are promising to establish ferroelectrics in the inventory of functional materials relevant at millimeter wavelengths. The potential for application of Landau's theory and a discussion of the role of phonon modes on the tunability is presented.

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  • Received 8 April 2019
  • Revised 10 October 2019

DOI:https://doi.org/10.1103/PhysRevB.100.184104

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Charlotte Cochard1, Thiemo Spielmann2, and Torsten Granzow3

  • 1Centre for Nanostructured Media, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, United Kingdom
  • 2IEE S.A., ZAE Weiergewan, 11, rue Edmond Reuter, L-5326 Contern, Luxembourg
  • 3MRT Department, Luxembourg Institute of Science and Technology (LIST), 4362 Esch-sur-Alzette, Luxembourg

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Issue

Vol. 100, Iss. 18 — 1 November 2019

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