Atomically imprinted graphene plasmonic cavities

general strategy to atomically imprint low-loss graphene plasmonic structures oxidation-activated charge transfer (OCT). graphene with a monolayer of WSe 2 , which is subsequently oxidized into high work-function WO x to activate charge transfer. Nano-infrared imaging reveals low-loss plasmon polaritons at the WO x /graphene interface. We insert WSe 2 spacers to precisely control the OCT-induced density and achieve a near-intrinsic quality of Finally, we imprint laterally abrupt doping with single-digit nanoscale precision via programmable OCT. we appealing elusive resonators based on free-standing graphene encapsulated in WO x Our results open avenues for novel quantum photonic architectures incorporating two-dimensional materials.