Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 24: Terahertz Spintronics I

MA 24.5: Vortrag

Mittwoch, 20. März 2024, 10:30–10:45, EB 202

On-chip sub-THz electrical pulse train generation by sequentially emitting Spintronic Terahertz Emitters — •Bikash Das Mohapatra¹ and Georg Schmidt^{1, 2} — ¹Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 3, 06120 Halle, Germany — ²Interdisziplinäres Zentrum für Materialwissenschaften, Martin-Luther-Universität Halle-Wittenberg, Heinrich-Damerow-Strasse 4, 06120 Halle, Germany

This study explores the concept of using a sequence of ultrashort electrical pulses[1] generated by spintronic THz emitters (STE) integrated into a waveguide. The fundamental frequency of the resulting burst is determined by the position of the respective emitters and the pulse propagation velocity in the waveguide. The result is an electrical pulse train, currently at sub-THz frequencies but theoretically the frequency range can be extended into the THz regime. The electrical response was measured using a 50 GHz sampling oscilloscope. These pulse trains are subject to tuning based on the STE size, path length between the STEs, and the position of the laser spot. Notably, the central frequency of the power spectrum is determined by the inter-STE distance. Furthermore, various temporal and spatial manipulation techniques enable the digital encoding of these pulse trains. This work is quite promising for the development of components with potential Ultrafast Spintronics device applications.

[1] W. Hoppe et al. "On-Chip Generation of Ultrafast Current Pulses by Nanolayered Spintronic Terahertz Emitters", ACS Applied Nano Materials 2021 4(7), 7454-7460, DOI: 10.1021/acsanm.1c01449

Keywords: Ultrafast phenomena; THz Spintronics devices; Ultrafast applications