Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Ultrafast Magnetization Effects 1
MA 8.8: Vortrag
Montag, 5. September 2022, 16:45–17:00, H37
Does the orbital angular momentum of light affect ultrafast demagnetization? — •Eva Prinz1, Benjamin Stadtmüller1,2, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, Germany — 2Institute of Physics, Johannes Gutenberg University Mainz, Germany
Optical fields can carry an orbital angular momentum (OAM) in helical beams with an azimuthal phase dependence. Since its discovery in 1992 [1], there has been a variety of applications of light with additional OAM, such as quantum entanglement, micro manipulation, communication, and microscopy [2].
Our research is focused on exploring the potential effects of the OAM of light on laser-induced ultrafast demagnetization. In this field, the question of how the angular momentum is conserved during spin-flips is not fully answered. Pumping the system with photons carrying OAM offers the potential to provide new insights, not only into the dissipation of angular momentum in the material but also into the interaction of photonic OAM with matter in general.
We investigate ultrafast demagnetization of ferromagnetic thin films induced by OAM light with time-resolved magneto-optic Kerr-effect measurements. We observed peculiar demagnetization dynamics that have so far not been observed for light without OAM.
[1] Allen et al., Phys. Rev. A 45 (1992)
[2] Shen et al., Light: Science & Applications 8 (2019)