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
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-9180
Version:	Published version
Publication type:	Zeitschriftenaufsatz
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Physical review applied 19 3
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