Electronic Exciton–Plasmon Coupling in a Nanocavity Beyond the Electromagnetic Interaction Picture

The optical response of a system formed by quantum emitter and plasmonic gap nanoantenna is theoretically addressed within the frameworks classical electrodynamics time-dependent density functional theory (TDDFT). A fully many-body description electron dynamics TDDFT allows for analyzing effect electronic coupling between nanoantenna, usually ignored in descriptions response. We show that hybridization states those metallic nanoparticles strongly modifies energy, width, very existence resonances coupled system. thus conclude application treatment correctly addresses charge-transfer processes crucial to address complex involving plasmon–exciton interactions directly impacting optoelectronic applications.