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Authors: Balos, Vasileios
Müller, Patrick
Jakob, Gerhard
Kläui, Mathias
Sajadi, Mohsen
Title: Imprinting the complex dielectric permittivity of liquids into the spintronic terahertz emission
Online publication date: 19-May-2022
Language: english
Abstract: We report an approach in time-domain terahertz (THz) spectroscopy for measuring the dielectric response of liquids based on inherent properties of spintronic THz emitters (STEs). The THz electric field radiated from the STE is inversely proportional to the sum of the complex refractive indices of the media surrounding the thin metallic stack of the STE and the stack's conductivity. We demonstrate that by bringing a liquid in contact with the emitter, its complex refractive index and accordingly its dielectric response are imprinted into the radiated electromagnetic field from the emitter. We use water as the test liquid and ascertain its dielectric loss and permittivity in the range of similar to 0.3-15 THz.
DDC: 530 Physik
530 Physics
Institution: Johannes Gutenberg-Universität Mainz
Department: FB 08 Physik, Mathematik u. Informatik
Place: Mainz
Version: Published version
Publication type: Zeitschriftenaufsatz
Document type specification: Scientific article
License: CC BY
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Journal: Applied physics letters
Pages or article number: 091104
Publisher: American Institute of Physics
Publisher place: Melville, NY
Issue date: 2021
ISSN: 0003-6951
Publisher DOI: 10.1063/5.0056909
Appears in collections:JGU-Publikationen

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