Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 41: Poster III
MA 41.13: Poster
Donnerstag, 20. März 2025, 15:00–17:30, P3
Enhancement of spintronic terahertz frequency conversion efficiency via grating structures — •Hatice Nur Koyun1, Ruslan Salikhov1, Ciaran Fowley1, Jürgen Lindner1, Stephan Winnerl1, Artur Erbe1,2, Manfred Helm1,2, Jürgen Faßbender1,2, and Sergey Kovalev1,3 — 1Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany — 2Technische Universität Dresden, 01062, Dresden, Germany — 3Technische Universität Dortmund, 44227, Dortmund, Germany
Spintronic terahertz (THz) frequency conversion in ferromagnet/heavy-metal heterostructures has the potential to develop spintronic THz emitters for the high-speed communication and data processing units. Applying the ultrafast demagnetization gives rise to spintronic THz frequency conversion with the appearance of THz second harmonic generation (TSHG). In the case of optimizing the potential for the spintronic THz frequency conversion, the limitations of low power efficiency can be overcome by using subwavelength structures such as an arrays of slits. In this study, we explore a pathway for efficiency enhancement by utilizing periodic gold arrays with a grating period smaller than the THz wavelength, which results in increased local THz fields. By varying the gap and width of the gold arrays, we find that the TSHG power efficiency increases with decreasing gap size of the grating. Furthermore, we demonstrate the potential for cavity enhancement, which can improve and control THz emission from spintronic THz emitters by placing a gold periodic array on the backside of a quartz glass substrate.
Keywords: THz second harmonic generation; cavity structure; gold arrays