Fig. 4. Enhanced coupling of QD and PNRs due to collective coupling of band-edge states and near-field proximity effect.

(A) Diagram of energy levels of a CdSeTe/ZnS nanocrystal weakly coupled (top) and strongly coupled (bottom) to a resonator. Fine-structure splitting into bright (black lines) and dark states (gray lines). Incoherent excitation from the ground state G into a pump state P and subsequent relaxation to the band edge E. (B) Top: Sketch of the near-field distribution at the apex of the resonator (pure mode). Bottom: Strongly coupled mesoscopic emitter influences the pure mode field via near-field proximity interaction (influential and image charging).