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Strong interactions between surface plasmons in ultra-compact nanocavitiesand excitons in two dimensional materials have attracted wide interests for itsprospective realization of polariton devices at room temperature. Here, wepropose a continuous transition from weak coupling to strong coupling betweenexcitons in MoS2 monolayer and highly localized plasmons in ultra-compactnanoantenna. The nanoantenna is assembled by a silver nanocube positioned overa gold film and separated by a dielectric spacer layer. We observed a 1570-foldenhancement in the photoluminescence at weak coupling regime in hybridnanocavities with thick spacer layers. The interaction between excitons andplasmons is then directly prompted to strong coupling regime by shrinking downthe thickness of spacer layer. Room temperature formation of polaritons withRabi splitting up to 190 meV was observed, which is the largest plasmon-excitonRabi splitting reported in two dimensional materials. Numerical calculationsquantified the relation between coupling strength, local density of states andspacer thickness, and revealed the transition between weak coupling and strongcoupling in nanocavities. The findings in this work offer a guideline forfeasible designs of plasmon-exciton interaction systems with gap plasmoniccavities.

Manipulating Coherent Light Matter Interaction: Continuous Transition  between Strong Coupling and Weak Coupling in MoS2 Monolayer Coupled with  Plasmonic Nanocavities