Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Poster 1
MA 19.51: Poster
Dienstag, 6. September 2022, 17:30–20:00, P2
Characterizing electro-optic terahertz analyzers using a polarization-tunable spintronic terahertz emitter — •Genaro Bierhance1,2, Oliver Gueckstock1,2, and Tobias Kampfrath1,2 — 1Department of Physical Chemistry, Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany — 2Department of Physics, Freie Universität Berlin, 14195 Berlin, Germany
One goal of current spintronics research is to push the speed of spin torques, transport and their detection to terahertz (THz) frequencies. Here, THz spectroscopy is a powerful tool that provides immediate access to the femtosecond time scales of spin dynamics. The toolbox of THz spectroscopy was recently extended by spintronic emitters (STEs), which provide efficient, spectrally broad and gapless emission in the THz frequency range.
Here, we show that the emitted THz field has a linear polarization with a high intensity purity. The polarization axis can easily be set by an external magnetic field. Subsequently, we use this property to quantify the capability of the electro-optic crystals ZnTe and GaP as THz polarization analyzers in the context of electro-optic THz detection. We find excellent performance with frequency-resolved intensity extinction ratios up to 40,000:1.