Enhanced spontaneous emission of mid-infrared dipole emitter in double-layer graphene waveguide.

We present a double-layer graphene waveguide which can greatly enhance spontaneous emission rate (SER) of electric dipole emitter placed in it. With properly designed parameters, numerical results show that SER enhanced factors as high as 2.127 × 10(6) and 1.941 × 10(5) can be achieved for two different dipole moment orientations, respectively. The influences of waveguide thickness, existence of supporting layer and gating electrodes, location offset of the emitter and dipole moment orientation on spontaneous emission enhancement are also studied in this paper. To the best of our knowledge, this is the first numerical study of SER enhanced effect in complicated graphene structure.