PLD Epitaxial Thin‐Film BaTiO₃ on MgO − Dielectric and Electro‐Optic Properties
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Date
2024-01-04
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Journal Article
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Abstract
The study demonstrates high-quality pulsed-laser-deposited (PLD) barium titanate (BTO) thin-films on a magnesium oxide substrate. The frequency response of the relative permittivity (dielectric constant) and the linear electro-optical coefficient (Pockels coefficient) are measured. At 0.2 GHz, the Pockels coefficient is fitted to be r42 ≈ 1030 pm V−1. It decreases to ≈390 pm V−1 at 10 GHz after which it remains constant up to 70 GHz. The unbiased BTO permittivity is measured to be εa ≈ 7600 at 0.2 GHz, dropping to ≈1100 at 67 GHz, while the biased BTO had a permittivity εa ≈ 2000 at 0.2 GHz, dropping to ≈500 at 67 GHz. These results fill an important experimental characterization gap for high-speed BTO applications and show the high quality of PLD-grown BTO films. Lastly, the material's crystalline quality is characterized and the domain distribution is imaged. The findings enable the design and fabrication of a new generation of BTO-based components for sensing and communications.
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published
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Journal / series
Volume
11 (1)
Pages / Article No.
2300665
Publisher
Wiley-VCH
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Subject
BaTiO₃; Plasmonic Devices; PLD; Pockels Coefficient; Relative Permittivity
Organisational unit
03974 - Leuthold, Juerg / Leuthold, Juerg
08705 - Gruppe Pané Vidal
02635 - Institut für Elektromagnetische Felder / Institute of Electromagnetic Fields
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Funding
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871391 - Energy- and Size-efficient Ultra-fast Plasmonic Circuits for Neuromorphic Computing Architectures (EC)
208094 - Nonlinear Pockels Materials for Nanoscale Devices (SNF)
871391 - Energy- and Size-efficient Ultra-fast Plasmonic Circuits for Neuromorphic Computing Architectures (EC)
208094 - Nonlinear Pockels Materials for Nanoscale Devices (SNF)