Plasmon-Induced Transparency in Metamaterial Based on Graphene and Split-Ring Resonators

We present a design of a terahertz plasmon induced transparency (PIT) metamaterial based on a graphene patch and split-ring resonator (SRR) pair. The PIT metamaterial exhibits a sharp-induced transparency peak resulting from the destructive interference between the direct-excited plasmon resonance in the graphene patch acting as the bright mode and the coupling-excited inductive-capacitive resonance in the SRR pair acting as the dark mode. Tuning the Fermi energy in graphene results in the modulation of the PIT window, allowing for the active control of the group index. These results may lead to promising applications in tunable terahertz devices, slow light, and sensing technology.