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Modulating the polarization of broadband terahertz pulses from a spintronic emitter at rates up to 10 kHz

MPS-Authors
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Gückstock,  Oliver
Department of Physics, Freie Universität Berlin;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Nadvornik,  Lukas
Department of Physics, Freie Universität Berlin;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Faculty of Mathematics and Physics, Charles University;

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Seifert,  Tom
Department of Physics, Freie Universität Berlin;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Borchert,  Martin
Department of Physics, Freie Universität Berlin;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Wolf,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Kampfrath,  Tobias
Department of Physics, Freie Universität Berlin;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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optica-8-7-1013.pdf
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Citation

Gückstock, O., Nadvornik, L., Seifert, T., Borchert, M., Jakob, G., Schmidt, G., et al. (2021). Modulating the polarization of broadband terahertz pulses from a spintronic emitter at rates up to 10 kHz. Optica, 8(7), 1013-1019. doi:10.1364/OPTICA.430504.


Cite as: https://hdl.handle.net/21.11116/0000-0008-ED1D-E
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° and 53° 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.