Magnetization-controlled terahertz harmonic generation with grating and cavity structures
Spintronic terahertz (THz) frequency conversion in ferromagnet/heavy metal (FM/HM) heterostructures has the potential to enhance high-speed data communication and advance ultrafast magnetic memory applications. By leveraging ultrafast spin currents and spin–orbit interactions in FM/HM systems, broadband THz generation can be achieved, with recent studies demonstrating spintronic THz second harmonic generation (TSHG) and optical rectification. We introduce concepts for controlling the frequency conversion and temporal characteristics of TSHG through active manipulation of FM magnetization, providing flexibility in second harmonic emission and waveform shaping. The TSHG valve is realized by employing THz metamaterials, consisting of hybrid FM/HM structures combined with subwavelength gold periodic arrays. Additionally, using microstructured gold periodic arrays, we investigate the TSHG field enhancement capability as a function of grating filling factor and explore the potential for TSHG cavity enhancement.
Authors
- Stephan Winnerl (ORCID: https://orcid.org/0000-0002-8090-9198)
- M. Helm (ORCID: https://orcid.org/0000-0001-8986-9914)
- Aleksandra Lindner (ORCID: https://orcid.org/0000-0002-5119-7769)
- Igor Ilyakov (ORCID: https://orcid.org/0000-0002-5928-7996)
- J. Lindner (ORCID: https://orcid.org/0000-0002-4955-515X)
- Klaas‐Jan Tielrooij (ORCID: https://orcid.org/0000-0002-0055-6231)
- Thales V. A. G. de Oliveira (ORCID: https://orcid.org/0000-0002-4886-0654)
- Ciarán Fowley (ORCID: https://orcid.org/0000-0002-3025-4883)
- J. Faßbender (ORCID: https://orcid.org/0000-0003-3893-9630)
- Hatice Nur Koyun (ORCID: https://orcid.org/0000-0003-1814-2472)
- Artur Erbe (ORCID: https://orcid.org/0000-0001-6368-8728)
- Ruslan Salikhov (ORCID: https://orcid.org/0000-0001-8461-0743)
- Sebastian Köber
- R. Narkowicz (ORCID: https://orcid.org/0000-0003-4793-3281)
- Jan‐Christoph Deinert (ORCID: https://orcid.org/0000-0001-6211-0158)
- Sergey Kovalev (ORCID: https://orcid.org/0000-0002-2290-1016)
- Nupur Sontakkey
Institutions
- TU Dortmund University (DE)
- Helmholtz-Zentrum Dresden-Rossendorf (DE)
- Leibniz Institute for Solid State and Materials Research (DE)
- Institut Català de Nanociència i Nanotecnologia (ES)
- Technische Universität Dresden (DE)
- Eindhoven University of Technology (NL)
Publication Details
- Journal
- Journal of Applied Physics
- Published
- 2025-10-13
- DOI
- https://doi.org/10.1063/5.0248907
- Primary Topic
- Terahertz technology and applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Centres de Recerca de Catalunya
- Institut Català de Nanociència i Nanotecnologia
- European Commission
- Deutsche Forschungsgemeinschaft
- Generalitat de Catalunya
- Helmholtz-Zentrum Dresden-Rossendorf
- Agencia Estatal de Investigación