Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Poster 1
MA 19.54: Poster
Dienstag, 6. September 2022, 17:30–20:00, P2
Spectral characteristics of microstructured spintronic THz emitters — •Rieke von Seggern1, Christopher Rathje1, Leon Gräper1, Jana Kredl2, Jakob Walowski2, Markus Münzenberg2, and Sascha Schäfer1 — 1Institute of Physics, University of Oldenburg, Germany — 2Institute of Physics, University of Greifswald, Germany
The introduction of spintronic terahertz emitters (STE) opened up a new class of terahertz (THz) sources with useful properties for spectroscopy applications, such as an ultrabroad and gapless emission spectrum and high THz peak field strengths [1].
Here, a resonator-grafted STE bilayer (CoFeB/Pt) is illuminated by a focused optical excitation pulse (780-nm central wavelength, 70-fs pulse duration, 16-um FWHM spot size) to generate a micrometer-scale broadband THz source. The radiated THz field coupled to the adjacent resonator is recorded via electro-optic sampling, dependent on the excitation location. Remarkably, the emitted THz signal changes drastically due to the coupling of the local dipole to the microresonators [2]. The spectral influence of different resonator geometries is experimentally demonstrated, and the underlying physical mechanisms are discussed based on detailed numerical simulations of the phenomenon. Special emphasis is placed on the interplay between intrinsic resonator characteristics and angular THz emission distributions.
[1] Seifert et al., Nat. Photonics 10, 483 (2016)
[2] Rathje, von Seggern et al., manuscript in preparation