Single‐Photon Emission From TMDCs through Strong Coupling to EQ Plasmon Modes of an Au Metasurface

ABSTRACT In this study, we theoretically demonstrate that a strongly coupled hybrid platform consisting of a compact gold plasmonic metamaterial (metasurface) and a monolayer of transition‐metal dichalcogenides (TMDCs) enables scalable single‐photon emission (SPE) at room temperature. The Au metasurface is designed to support electric‐quadrupole (EQ) resonance that efficiently couples to excitons in tungsten diselenide (), molybdenum disulfide (), and molybdenum diselenide (). The planar metasurface geometry enables in‐plane field overlap with the TMDC exciton, yielding a pronounced coupling strength with a vacuum Rabi splitting exceeding 100 meV. To connect this enhanced coupling to our investigation of SPE purity, we first realized conventional photon blockade (CPB) in an Au– hybrid under weak coherent driving, achieving . We then demonstrated unconventional photon blockade (UnPB) in Au–, Au–, and Au– using a two‐tone coherent drive to induce destructive interference between two‐photon excitation pathways, resulting in very high purity. Additionally, pure dephasing of the emitters up to meV was considered, and antibunching was preserved. These results establish a scalable route to room‐temperature, high‐purity SPE for quantum communication and integrated quantum photonics.