Tunable surface-plasmon-polariton-like modes based on graphene metamaterials in terahertz region

Plasmonic response in graphene-based metamaterials show great potential for terahertz (THz) wave manipulation. In this work, we study the tunable surface-plasmon-polariton-like modes based on graphene complementary split ring resonators (CSRRs) in THz region. Our study suggests that these modes can be generated by graphene plasmonic metamaterials due to the diffraction coupling of surface plasmon and propagating electromagnetic (EM) wave. Furthermore, the modes can be tuned by stacking graphene plasmonic metamaterials layers or by changing the graphene Fermi level with electric field. Our results suggest graphene plasmonic metamaterials for both physical understanding and novel applications in THz region.