Imprinting the complex dielectric permittivity of liquids into the spintronic terahertz emission

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 th...

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Bibliographic Details
Published in:Applied physics letters 2021-08, Vol.119 (9)
Main Authors: Balos, Vasileios, Müller, Patrick, Jakob, Gerhard, Kläui, Mathias, Sajadi, Mohsen
Format: Article
Language:English
Subjects:
Applied physics
Dielectric loss
Electric contacts
Electric fields
Electromagnetic fields
Emitters
Liquids
Permittivity
Refractivity
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Summary: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 ∼0.3–15 THz.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0056909