Published September 5, 2023 | Version v1
Publication Open

Fiber-tip spintronic terahertz emitters

  • 1. Fraunhofer Institute for Industrial Mathematics ITWM, Department Materials Characterization and Testing, 67663 Kaiserslautern, Germany
  • 2. Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
  • 3. University of Lille, CNRS, Centrale Lille, Université Polytechnique Hauts-de-France, UMR 8520 - IEMN, 59000 Lille, France
  • 4. Singulus Technologies AG, Hanauer Landstrasse 107, 63796 Kahl am Main, Germany
  • 5. Institute of Physics, Johannes-Gutenberg-Universität Mainz, 55128 Mainz, Germany
  • 6. Department of Physics, Freie Universität Berlin, 14195 Berlin, Germany
  • 7. TeraSpinTec GmbH, Lüneburger Str. 26, 10557 Berlin, Germany


Spintronic terahertz emitters promise terahertz sources with an unmatched broad frequency bandwidth that are easy to fabricate and operate, and therefore easy to scale at low cost. However, current experiments and proofs of concept rely on free-space ultrafast pump lasers and rather complex benchtop setups. This contrasts with the requirements of widespread industrial applications, where robust, compact, and safe designs are needed. To meet these requirements, we present a novel fiber-tip spintronic terahertz emitter solution that allows spintronic terahertz systems to be fully fiber-coupled. Using single-mode fiber waveguiding, the newly developed solution naturally leads to a simple and straightforward terahertz near-field imaging system with a 90%-10% knife-edge-response spatial resolution of 30 μm.



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MSCA ITN MagnEFi 860060
European Commission