Berlin 2024 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 2: 2D Materials and Heterostructures: Photonic Aspects
HL 2.8: Talk
Monday, March 18, 2024, 11:30–11:45, EW 201
Coupling of excitons in few-layer WS2 films with a hybrid plasmon polariton at room temperature — •Yuhao Zhang1, Hans-Joachim Schill1,2, Stephan Irsen2, and Stefan Linden1 — 1Physikalisches Institut, Rheinische Friedrich-Wilhelms-Universität Bonn, 53115 Bonn, Germany — 2Electron Microscopy and Analytics, Center of Advanced European Studies and Research (caesar), 53175 Bonn, Germany
Composite structures formed by the combination of plasmonics nanostructures that tightly confine light and TMDC thin film with a strong exciton resonance offer unique capabilities to investigate and engineer light-matter interactions in solid-state systems. So far, most research has focused on the strong coupling between plasmonic structures and TMDC monolayers. The strong coupling between few-layer TMDC with extended plasmonic nanostructures is still a largely unexploited territory.
In this work, we report on the room-temperature interaction of few layer WS2 thin films (monolayer to qudrilayer) with a tapered nanograting structure milled into a monocrystalline silver flake. The bare nanograting structure features hybrid plasmon polaritons (HPP) with three polariton branches. When a WS2 monolayer is deposited on the nanogroove array with an optimized design, the reflection spectra show an avoided crossing of the exciton mode and the lower plasmon polariton branch with a Rabi splitting of 68 meV indicating strong exciton-plasmon polariton coupling. The Rabi splitting increases to more than 100 meV in the case of the quadrilayer.
Keywords: TMDC thin film; Hybrid plasmon polariton; Exciton; Strong light-matter coupling; Silver nanogroove array