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O: Fachverband Oberflächenphysik
O 13: Plasmonics and nanooptics: Light-matter interaction, spectroscopy I
O 13.9: Talk
Monday, March 12, 2018, 17:15–17:30, MA 041
Visualization of photoemission quantum pathways via photon-plasmon spin-orbit mixing — •Eva Prinz1, Grisha Spektor2, Deirdre Kilbane3, Anna-Katharina Mahro1, Michael Hartelt1, Meir Orenstein2, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, Germany — 2Department of Electrical Engineering, Technion - Israel Institute of Technology, Israel — 3School of Physics, University College of Dublin, Ireland
Transformation of light carrying spin angular momentum (SAM) to an optical field vortex carrying angular momentum (OAM) has been of wide interest in recent years [1]. We measured the interaction between 3D light carrying axial SAM and 2D plasmon-polariton vortices carrying high order transverse OAM [2].
The interaction is mediated via two-photon absorption on a gold surface, imprinting the resulting angular momentum mixing into matter by excitation of electrons that are photo-emitted into vacuum and detected by PEEM. We show experimentally and theoretically that the absorptive nature of this interaction leads to both single and double photon-plasmon angular momentum mixing processes which correspond to different quantum pathways of the electron excitation.
[1] Bliokh et al., Nature Photonics 9 (2015)
[2] Spektor et al., Science 355 (2017)