We perform cavity quantum electrodynamics analysis to demonstrate that it is possible to design an electric spaser with an open resonator or a closed resonator with much weak feedback in the extreme quantum limit in an all-carbon platform. A carbon nanotube quantum dot plays the role of a gain element, and Coulomb blockade is observed. Graphene nanoribbons are used as the resonator, and surface plasmon polariton field distribution with quantum electrodynamics features can be observed.We work on carbon-based electric spaser in the extreme quantum limit.
The plasmonic resonator of the spaser is made from a graphene nanoribbon monolayer, and its active gain element is an electrically pumped carbon nanotube quantum dot. The graphene nanoribbons as waveguides are connected to the plasmonic resonator for transmission of SPP waves. The SPP modes are supported in the plasmonic resonator, and the gain medium is population inverted to supply energy to the plasmonic modes.From an engineering perspective, our work makes preparations for integrating spasers into nanocircuits and/or photodynamic therapy applications.
This project is supported from the Australian Research Council Discovery Grant and the National Natural Science Foundation of China and Natural Science Foundation of Shanghai and Shanghai Pujiang Program.