Stark Control of Plexcitonic States in Incoherent Quantum Systems

In this study, we demonstrate the coherent control of plexcitonic modes in (i) off-resonant and (ii) resonant coupled plasmon-emitter systems through the optical Stark effect (OSE). By leveraging the Stark shift in degenerate energy eigenstates of two- or three-level quantum emitters (QEs) embedded in plasmonic nanocavities, we demonstrate tunable photoluminescence, coherent control of plexcitonic states, and Stark-induced transparency. Our findings highlight the potential of Stark tuning to mitigate decoherence and enable on-demand control of spontaneous photon emission in the visible regime. These results pave the way for developing scalable and actively tunable photonic integrated circuits for quantum computing and information processing applications.