Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 87: Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy I
O 87.5: Talk
Thursday, March 20, 2025, 16:00–16:15, H4
Photoemission electron microscopy of Exciton-Polaritons in thin WSe2 waveguides — •Tobias Eul1, Victor DeManuel-Gonzalez1, Miwan Sabir1, Florian Diekmann1, Kai Rossnagel1,2,3, and Michael Bauer1,2 — 1Institute of Experimental and Applied Physics, Kiel University, 24098 Kiel, Germany — 2Kiel Nano, Surface and Interface Science KiNSIS, Kiel University, 24118 Kiel, Germany — 3Deutsches Elektronen-Synchrotron DESY, Ruprecht Haensel Lab, 22607 Hamburg, Germany
Exciton-polaritons emerging from the interaction of photons and excitons in the strong coupling regime are intriguing quasi-particles for the potential exchange of energy during light-matter interaction processes such as light harvesting. This coupling causes an energy anti-crossing in the photon dispersion centered around the exciton resonance, i.e. a Rabi-splitting between a lower and upper energetic branch. The size of this splitting correlates to the coupling strength between the exciton and the photonic modes. In this work, we investigate this coupling between excitons and photonic waveguide modes excited simultaneously in thin-film flakes of the transition-metal dichalcogenide WSe2. Using a Photoemission electron microscope, we are able to extract the dispersion of the TE- and TM-modes propagating through these flakes as well as extract the energy splitting. Ultimately, our findings precipitate the investigation of the propagation of exciton-polaritons in the time-domain via time-resolved photoemission.
Keywords: Exciton-Polaritons; Transition-Metal Dichalcogenides; Waveguides; Photoemission electron microscopy