▎ 摘　　要

Surface plasmon polariton nanolaser, which can achieve all-optical circuits and optoelectronic integration, is a major research area in nano-optics. We propose a novel tunable nanolaser that combines graphene and traditional metal-dielectric waveguide. We can tune the gain threshold and ejection frequency according to changes in the electronic characteristics of graphene and the structural parameters of the nanolaser. When the Fermi energy level is 0.8 eV, the Q-factor can reach 85, thereby indicating the outstanding performance of the nanolaser in manufacturing. We also found that the gain threshold will stop increasing when carrier mobility is increased to 2000 2/V.s. Compared with the conventional silver strip structure, the proposed nanolaser exhibits better performance at h_gap = 0 nm. On that condition, the optimal values of propagation loss and the normalized mode area are 0.13 and 0.0001 dB/mu m, respectively. The proposed nanolaser can overcome the challenges of high speed, miniaturization, and integration in optoelectronic integrated technology.