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.

过渡金属二硫化碳（TMD）单层与等离子体纳米结构之间的激子-极化子耦合产生了物理上丰富的附加状态，近年来引起了广泛关注。在激子-极化子耦合中，对拉比分裂中的电子能量交换的理解至关重要。用于研究耦合的典型结构是“嵌入在镜面金属纳米粒子（NPoM）系统中的TMD单层”。然而，激子取向不平行于NPoM系统的感应偶极方向，这导致低效的耦合。我们提出的一维等离激元纳米槽（NGs）可以使MoS ₂对准单层的激子取向和等离激元极化子平行，解决了上述问题。此外，我们清楚地揭示了由于载流子重排引起的光激发，中间耦合样品上的最大表面电势（SP）变化。结果，证明了在室温下显着的拉比分裂（65meV）。此外，我们将光致发光增强归因于平行的激子-极化子相互作用。