Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 41: Poster III
MA 41.12: Poster
Thursday, March 20, 2025, 15:00–17:30, P3
Exploring the Coupling of Broadband Terahertz Dipoles to Metasurfaces — •Daniel Geyer1, Rieke von Seggern1, and Sascha Schäfer1,2 — 1Department of Physics, University of Regensburg, Regensburg, Germany — 2Regensburg Center for Ultrafast Nanoscopy (RUN), Regensburg, Germany
Terahertz (THz) spectroscopy has emerged as a powerful tool for accessing low-energy excitations in matter, offering direct insights into fundamental material properties that govern electronic, thermal, and magnetic behaviors. In addition to large-area THz emission spectroscopy, a strongly confined THz source can be employed to locally map a material's response.
In this work, we explore the implementations of ultrathin THz sources coupled to plasmonic structures. Firstly, we demonstrate the microscale mapping of the coupling strength between resonator structures and localized terahertz dipoles on a patterned spintronic emitter [1]. In addition, we investigate the THz response of near-field-coupled topological metasurfaces based on the Su-Schrieffer-Heeger (SSH) model [2]. Lastly, we discuss the application of novel THz sources based on two-dimensional van-der-Waals materials.
[1] Rathje et al., ACS Photonics 10, 3435 (2023)
[2] Moritake et al., Nanophotonics 11, 2183 (2022)
Keywords: Spintronic THz emitter; THz emission microscopy; Localized excitation; Metasurfaces; Electro-optic sampling