Metal-graphene hybrid terahertz metamaterial based on dynamically switchable electromagnetically induced transparency effect and its sensing performance

A dynamically switchable electromagnetically induced transparency (EIT) based on metal-graphene hybrid metamaterial is proposed. The EIT metamaterial consists of two split-ring resonator (SRRs) and two orthogonal cut-wires (CWs) with different length. The EIT metamaterial illuminated by y-polarized and x-polarized incident waves exhibits two different EIT effects, which can be explained by multipole scattering theory and three-dimensional schematic diagrams. The simulated EIT spectra are almost identical to the theoretical EIT spectra calculated by the two-particle model. Two EIT effects and theirs group delays can be dynamically tunable by manipulating the Fermi level of graphene on two SRRs. Moreover, EIT metamaterial shows good sensing per-formance with the sensitivities of 0.185 THz/RIU and 0.160 THz/RIU in the x and y polarization directions, respectively. Our EIT metamaterial realizes dynamically switchable EIT effect and provides a novel approach for applications in slow light devices and sensors.