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Authors: Rouzegar, Reza
Chekhov, Alexander
Behovits, Yannic
Serrano, B. R.
Syskaki, Maria-Andromachi
Lambert, C. H.
Engel, Dieter
Martens, Ulricke
Münzenberg, Markus
Wolf, M.
Jakob, Gerhard
Kläui, Mathias
Seifert, Tom S.
Kampfrath, Tobias
Title: Broadband spintronic terahertz source with peak electric fields exceeding 1.5 MV/cm
Online publication date: 15-Jun-2023
Year of first publication: 2023
Language: english
Abstract: In this work, we improve the performance of an optically pumped spintronic terahertz emitter (STE) by a factor of up to 6 in field amplitude through an optimized photonic and thermal environment. Using high-energy pump pulses (energy 5 mJ, fluence >1 mJ / cm 2 , wavelength 800 nm, duration 80 fs), we routinely generate terahertz pulses with focal peak electric fields above 1.5 MV/cm, fluences of the order of 1 mJ / cm 2 , and a spectrum covering the range 0.1–11 THz. Remarkably, the field and fluence values are comparable to those obtained from a state-of-the-art terahertz table-top high-field source based on tilted-pulse-front optical rectification in Li Nb O 3 . The optimized STE inherits all attractive features of the standard STE design, for example, ease of use and the straightforward rotation of the terahertz polarization plane, without the typical 75% power loss found in Li Nb O 3 setups. It, thus, opens up a promising pathway to nonlinear terahertz spectroscopy. Using low-energy laser pulses (2 nJ, 0.2 mJ / cm 2 , 800 nm, 10 fs), the emitted terahertz pulse has a focal peak electric field of 100 V/cm, which corresponds to a 2-fold improvement, and covers the spectrum 0.3–30 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
License: CC BY
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Journal: Physical review applied
Pages or article number: 034018
Publisher: American Physical Society
Publisher place: College Park, Md. u.a.
Issue date: 2023
ISSN: 2331-7019
Publisher DOI: 10.1103/PhysRevApplied.19.034018
Appears in collections:JGU-Publikationen

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