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In this work, a new structure is suggested for spasing. The presented spaseris made up of a graphene nanosphere, which supports localized surface plasmonmodes, and a quantum dot array, acting as a gain medium. The gain medium ispumped by an external laser source. Since all the plasmons are carried on agraphene platform, the structure features coherent surface plasmons with highconfinement and large life time. All the structure is analyzed theoreticallyusing full quantum mechanical description. The main advantage of the proposedspaser is the simple tuning capability of it by changing graphene Fermi levelwhich is performed by either chemical doping in the manufacturing time orelectrostatic gating. We suggest utilizing the proposed spaser for excitingcoherent, long range surface plasmons on a graphene sheet. The near field ofthe spaser couples to the surface plasmons on graphene sheet and compensatesthe large momentum mismatch between surface plasmons and photons.

A Tunable Spherical Graphene Spaser