Fig. 1

(a) Periodic and (b) unit cell views of the designed frequency-multiplexed tunable logic device based on graphene-integrated metamaterial, which consists of two circular ring resonator array in the terahertz region. The layers making the metamaterial are graphene, dielectric, and gold. Graphene is modeled as surface conductivity. We have used graphene nanostrips with a width of 100 nm to bias the ring resonator array and a gold layer at the bottom of the metamaterial to prevent the transmission of electromagnetic waves. The two logical input values are set by adjusting the Fermi levels of the two graphene-based circular resonators. Inputs states and their logic definition are also determined in the table. Relection of the metamaterial is considered as the output of the logic gates.