Active Graphene Plasmonics with a Drift-Current Bias

We theoretically demonstrate that a system formed by drift-current biased graphene sheet on silicon carbide substrate enables loss compensation and plasmon amplification. The active response of the is rooted in optical pumping plasmons with gain provided streaming current carriers. proposed behaves as an amplifier for copropagating drifting electrons strong attenuator counter-propagating plasmons. Furthermore, we show feedback obtained connecting input output system, example, ring-shaped graphene–silicon nanoresonator, combined electrons, may lead to spasing.