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Engineering light-matter interactions up to the strong-coupling regime atroom temperature is one of the cornerstones of modern nanophotonics. Achievingthis goal will enable new platforms for potential applications such as quantuminformation processing, quantum light sources and even quantum metrology.Materials like transition metal dichalcogenides (TMDC) and in particulartungsten disulfide (WS$_2$) possess large transition dipole moments comparableto semiconductor-based quantum dots, and strong exciton binding energiesallowing the detailed exploration of light-matter interactions at roomtemperature. Additionally, recent works have shown that coupling TMDCs toplasmonic nanocavities with light tightly focused on the nanometer scale canreach the strong-coupling regime at ambient conditions. Here, we use ultra-thinsingle-crystalline gold nanodisks featuring large in-plane electromagneticdipole moments aligned with the exciton transition-dipole moments located inmonolayer WS$_2$. Through scattering and reflection spectroscopy we demonstratestrong coupling at room temperature with a Rabi splitting of $\sim$108 meV. Inorder to go further into the strong-coupling regime and inspired by recentexperimental work by St\"uhrenberg et al., we couple these nanodisks tomultilayer WS$_2$. Due to an increase in the number of excitons coupled to ournanodisks, we achieve a Rabi splitting of $\sim$175 meV, a major increase of62%. To our knowledge, this is the highest Rabi splitting reported for TMDCscoupled to open plasmonic cavities. Our results suggest that ultra-thinsingle-crystalline gold nanodisks coupled to WS$_2$ represent an exquisiteplatform to explore light-matter interactions.

Single-crystalline gold nanodisks on WS$_2$ mono- and multilayers: Strong coupling at room temperature