Robust strong coupling of single quantum emitters with plasmonic nanocavity on one-dimensional photonic crystal...

The plasmonic nanocavity with extremely localized field distribution can facilitate strong coupling with emitters at the level of single quanta. However, the dramatic variation of the plasmon field with distance on the surface of nanocavity makes the strength of the interaction very sensitive to the location of the individual emitter. Here, we present a new strategy that achieves room-temperature strong coupling by integrating a single CdSe/ZnS quantum dot with a bowtie-structured plasmonic nanocavity on a one-dimensional photonic crystal (1DPC) substrate. This kind of hybrid cavity enables a more uniform field distribution in the nanogap, which is more robust and stable. The Rabi splitting with single exciton reached $\sim$ 170 meV and the lifetime of photon emission is reduced by $\sim$ 5 times. This work provides an new way to construct solid-state cavity quantum electrodynamic system in strong coupling region at room temperature.