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HL: Fachverband Halbleiterphysik
HL 47: 2D Materials IV: Interfacial Interactions (joint session O/CPP/HL)
HL 47.12: Vortrag
Mittwoch, 18. März 2020, 13:15–13:30, WIL B321
Signatures of strong coupling between WS2 excitons and surface plasmon polariton waves — Moritz Gittinger1, Sven Stephan1, Trung Nguyen1, Antonietta deSio1, •Martin Silies1, Christoph Lienau1, Alison Cadore2, Ilya Goykhman2, and Andrea Ferrari2 — 1Institute of Physics and Center of Interface Science, Carl von Ossietzky Universität Oldenburg — 2Cambridge Graphene Centre, University of Cambridge, UK
All-solid-state strong coupling systems with large vacuum Rabi splitting energies are of great potential in future technologies such as quantum information processing. Here, atomically thin layers of transition metal dichalcogenides in close vicinity to metallic nanoparticles have recently been explored as excellent candidates for the observation of this coherent energy transfer from the exciton to its localized surface plasmon counterpart [1]. We here present first results of the interaction between surface plasmon polariton (SPP) waves induced in focused-ion beam written gratings in planar silver films with excitons from atomically-thin WS2 flakes. By using confocal angle-resolved reflectance spectroscopy, the dispersion relation of the coupled system is mapped at room temperature. We observe a clear anti-crossing of the exciton and the SPP resonance with a normal mode splitting of up to 50meV. We take this splitting as a first signature for a strong coupling between the WS2 exciton and the SPP wave in the silver grating [2].
[1] Schneider C. et al, Nature Comm. 9, 2695 (2018) [2] Vasa P, and C. Lienau, ACS Photonics 5, 2-23 (2018)