A compact graphene metamaterial based on electromagnetically induced transparency effect

Graphene has become an ideal material in the terahertz band, for its excellent properties and its variable carrier density (which can be modified by bias voltage). A compact metamaterial based on graphene was proposed here using the nesting of rectangular rings into square rings to produce electromagnetically induced transparency (EIT) in the terahertz frequency band. In this present paper, we investigated the effects of structural parameter changes on EIT phenomena, the electrical tunability of graphene materials, and their sensor performances and slow-light properties. Due to the sensitivity of the EIT window to changes in the surrounding environment, the simulation results show that its sensitivity and FOM(figure of merit) can achieve 2.26 THz/RIU and 6.21 respectively. Therefore, this paper proposed a compact design structure of graphene, which not only has the unique electrical properties of graphene but also has adjustable characteristics. This will lay a good foundation for future refractive index sensors and other miniaturized devices.