Authors:	Gueckstock, Oliver Nádvorník, Lukáš Seifert, Tom S. Borchert, Martin Jakob, Gerhard Schmidt, Georg Woltersdorf, Georg Kläui, Mathias Wolf, Martin Kampfrath, Tobias
Title:	Modulating the polarization of broadband terahertz pulses from a spintronic emitter at rates up to 10 kHz
Online publication date:	17-Sep-2021
Year of first publication:	2021
Language:	english
Abstract:	Reliable modulation of terahertz electromagnetic waveforms is important for many applications. Here, we rapidly modulate the direction of the electric field of linearly polarized terahertz electromagnetic pulses with 1-30 THz bandwidth by applying time-dependent magnetic fields to a spintronic terahertz emitter. Polarity modulation of the terahertz field with more than 99% contrast at a rate of 10 kHz is achieved using a harmonic magnetic field. By adding a static magnetic field, we modulate the direction of the terahertz field between angles of, for instance, -53 degrees and 53 degrees at kilohertz rates. We believe our approach makes spintronic terahertz emitters a promising source for low-noise modulation spectroscopy and polarization-sensitive techniques such as ellipsometry at 1-30 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-6340
Version:	Published version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Optica 8 7
Pages or article number:	1013 1019
Publisher:	OSA
Publisher place:	Washington, DC
Issue date:	2021
ISSN:	2334-2536
Publisher URL:	https://doi.org/10.1364/OPTICA.430504
Publisher DOI:	10.1364/OPTICA.430504
Appears in collections:	JGU-Publikationen