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Active nanoplasmonics has recently led to the emergence of many promisingapplications. One of them is spaser (surface plasmons amplification bystimulated emission of radiation) that has been shown to generate coherent andintense fields of selected surface plasmon modes that are strongly localized inthe nanoscale. We propose a novel nanospaser composed of metalnanoparticles-graphene nanodisks hybrid plasmonic system as its resonator and aquantum dots cascade stack as its gain medium. We derive the plasmonic fieldsinduced by pulsed excitation through the use of the effective medium theory.Based on the density matrix approach and by solving the Lindblad quantum masterequation, we get ultrafast dynamics of the spaser associated with coherentamplified plasmonic fields. The intensity of the latter is significantlyaffected by the width of the metallic contact and the time duration of thelaser pulse used to launch the surface plasmons. The proposed nanospaseroperates in the mid-infrared region that has received much attention due to itswide biomedical, chemical and telecommunication applications.

A Novel Metal Nanoparticles- Graphene Nanodisks- Quantum Dots Hybrid-System-Based Spaser