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MA: Fachverband Magnetismus
MA 11: Posters Magnetism III
MA 11.20: Poster
Wednesday, September 29, 2021, 13:30–16:30, P
Microstructured spintronic terahertz emitters — •Rieke von Seggern1, Christopher Rathje1, Leon Gräper1, Nina Meyer2, Markus Münzenberg2, and Sascha Schäfer1 — 1Institute of Physics, University of Oldenburg, Germany — 22Institute of Physics, University of Greifswald, Germany
In recent years, spintronic terahertz (THz) emitters have become a well-established source for strong single-cycle THz pulses [1]. In those metallic multilayer systems, an optically induced spin-polarized current pulse is converted into a transverse charge current, resulting in a broadband emission of THz radiation. In this work, we investigate different strategies for coupling the transverse current to micro-resonators on, or in close proximity, to the THz emitter surface and their influence on the detected THz spectrum. Various designs of resonator arrays were fabricated by electron beam lithography with expected resonance frequencies in the range of 0.5-4 THz. The resonances are visible as a decreased spectral THz amplitude at the corresponding resonance frequencies. A transition from a field- to a current-coupled regime is identified for decreasing distance between the resonator and the emitter, and compared to numerical modelling based on finite-element simulations.
[1] Seifert et al., Nat. Photonics 10, 483-488 (2016)