Molecular Optomechanics in the Anharmonic Cavity-QED Regime Using Hybrid Metal-Dielectric Cavity Modes

Using carefully designed hybrid metal-dielectric resonators, we study molecular optomechanics in the strong coupling regime (g(2)/omega(m) > kappa), which manifests in anharmonic emission lines in the sideband-resolved region of the cavity-emitted spectrum (kappa < omega(m)). This nonlinear optomechanical strong coupling regime is enabled through a metal-dielectric cavity system that yields not only deep-subwavelength plasmonic confinement but also dielectric-like confinement times that are more than two orders of magnitude larger than those from typical localized plasmon modes. These hybrid metal-dielectric cavity modes enable one to study new avenues of quantum plasmonics for single-molecule Raman scattering.