Stark control of plexcitonic states in incoherent quantum system.

Electro-optic control of quantum dots embedded in plasmonic nanocavities enables active tuning of photonic devices for emerging applications in quantum optics such as quantum information processing, entanglement, and ultrafast optical switching. Here, we demonstrate the coherent control of plexcitonic in (i) off-resonant and (ii) resonant coupled quantum systems through the optical Stark effect. We analyze a hybrid plasmon-emitter system under coupled harmonic oscillator model and derive the driven-disscipative dynamics through Heisenberg-Langevin approach. A small perturbation in the applied field modulates the energy eigenstates of the quantum emitter which modifies the hybrid modes in a coherent manner. The pronounced resonant shifts in the degenerate states of QE result in the coherent interference of dressed states leading to tunable photoluminescence, Stark-induced transparency, and vacuum Rabi splitting. In addition, a resonantly coupled system shows path interference of hybrid plexcitonic states due to Stark-induced splitting in a two-level QE. Our study shows that the Stark tuning of plexcitonic states not only mitigates decoherence in the quantum system but also stimulates the on/off switching of spontaneous photon emission in the visible regime. Such tunable systems can be used to operate photonic integrated circuits for applications in quantum computing and information processing.