Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: Poster I

MA 20.21: Poster

Dienstag, 19. März 2024, 16:30–19:00, Poster A

Narrow band THz Frequency emission from Micropatterned THz emitters — •Nikos Kanistras¹, Quentin Remy², Reza Rouzegar², Tobias Kampfrath², and Georg Schmidt¹ — ¹Institut für Physik, Martin-Luther Universität Halle Wittenberg, Von-Danckelmann-Platz 3, 06120 Halle, Germany — ²Department of Physics, Freie Universität Berlin, 14195 Berlin, Germany

THz frequency devices have gained significant attention driven by widespread application potential ranging from communication to nondestructive characterization techniques to astrophysics applications. Spintronic THz Emitters (STEs) show great potential to complement conventional semi-conducting materials due to their straightforward and cost-effective fabrication techniques resulting in seamless on-chip integration with modern device technologies[1].

While typical STEs exhibit a very broad emission spectrum[2], in some cases a narrow emission band may be preferred.

In this work we present a micropatterned spintronic THz emitter based on CoFeB/Pt bilayer, which creates a THz burst corresponding to a narrow band emission at the burst's fundamental frequency. The samples were fabricated by DC sputtering and optical lithography. The THz emission measurements were performed with a wide band detection range up to 40 THz. These devices demonstrate a viable and straightforward method to produce controlled emission in a well-defined THz frequency band.

[1] Seifert et al. Nature Photon 10, 483-488 (2016).

[2] Schmidt et al. Phys. Rev. Appl.,19:L041001 (2023).

Keywords: Spintronic THz Emitter; Micropatterning; Terahertz Spintronics; terahertz burst generation