▎ 摘　　要

Dispersion properties and confinement in Graphene-SiO2-Si structure have been investigated, and the properties of plasmons with an electric bias are mainly discussed. The results show that graphene plasmons have small loss which means plasmons can travel a long distance. It has a better confinement compared with metal, which can strongly confine energy at sub-wavelength scales. Plasmons in graphene also can be tuned and controlled via a gated voltage, thus providing an advantage for graphene over plasmons in metal-dielectric interface. The presented work is useful for the design of grapheme-based plasmons devices.