Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 21: Ultrafast Magnetization II
MA 21.11: Talk
Tuesday, March 17, 2020, 12:15–12:30, HSZ 101
The orbital angular momentum of light in ultrafast magnetism — •Eva Prinz1,2, Stephan Wust1, Martin Stiehl1, Jonas Hoefer1, Benjamin Stadtmüller1, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Staudingerweg 9, 55128 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], a variety of applications for the OAM of light has been brought forward, such as data storage, quantum cryptography, astronomy, communication, enhanced sensitivity in imaging techniques and optical tweezers [2].
Our research is focused on exploring potential effects of the orbital angular momentum of light on both laser-induced ultrafast demagnetization and all-optical switching (AOS). The light-matter interactions could be influenced either by a transfer of angular momentum from photons to the electron system, or by the induction of a magnetic field in the material via the inverse Faraday effect. We present first measurements of both time-resolved MOKE and MOKE-microscopy pumped with OAM light.
[1] Allen et al., Phys. Rev. A 45 (1992)
[2] Shen et al., Light: Science & Applications 8 (2019)