Abstract
Exciton–polariton coupling between transition metal dichalcogenide (TMD) monolayer and plasmonic nanostructures generates additional states that are rich in physics, gaining significant attention in recent years. In exciton–polariton coupling, the understanding of electronic-energy exchange in Rabi splitting is critical. The typical structures that have been adopted to study the coupling are “TMD monolayers embedded in a metallic-nanoparticle-on-mirror (NPoM) system.” However, the exciton orientations are not parallel to the induced dipole direction of the NPoM system, which leads to inefficient coupling. Our proposed one-dimensional plasmonic nanogrooves (NGs) can align the MoS2 monolayers’ exciton orientation and plasmon polaritons in parallel, which addresses the aforementioned issue. In addition, we clearly reveal the maximum surface potential (SP) change on intermediate coupled sample by the photo-excitation caused by the carrier rearrangement. As a result, a significant Rabi splitting (65 meV) at room temperature is demonstrated. Furthermore, we attribute the photoluminescence enhancement to the parallel exciton–polariton interactions.
Highlights
Strong light–matter interactions exhibit many compelling features, owing to their potential applications in low-threshold lasing[1,2], Bose–Einstein condensate[3,4], and superfluidity[5,6]
Strong coupling in MoS2 monolayers on 1D plasmonic NGs Figure 1a depicts a two-level system with the ground state (|g〉) and excited state (|e〉) separated by ћωbg, which denotes the coupling of a 2D material exciton with an NG cavity
When the energy-exchange rate Ω is higher than the decay rate (γ, ĸ) of this system, two polaritonic states (upper polariton branch (UPB) and lower polariton branch (LPB)) are formed, which are separated by Rabi splitting
Summary
Strong light–matter interactions exhibit many compelling features, owing to their potential applications in low-threshold lasing[1,2], Bose–Einstein condensate[3,4], and superfluidity[5,6]. The coherent energy exchange between excitons and plasmons in the strong-coupling regime and intermediate coupling can promote charge transfer which has been discussed using far-field pump-probe measurements[27,28]. Strong coupling in MoS2 monolayers on 1D plasmonic NGs Figure 1a depicts a two-level system with the ground state (|g〉) and excited state (|e〉) separated by ћωbg, which denotes the coupling of a 2D material exciton with an NG cavity.
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