Fig. 4 | Scientific Reports

Fig. 4

From: Frequency-multiplexed tunable logic device based on terahertz graphene-integrated metamaterial composed of two circular ring resonator array

Fig. 4

Reflection spectra of the metamaterial structure shown in Fig. 1 for different input logic states under TM wave illumination. The logic states correspond to different combinations of Fermi levels applied to the left and right graphene rings: Input 1 = 0; Input 2 = 0: both rings connected to 0.6 eV. Input 1 = 0; Input 2 = 1: left ring connected to 0.6 eV, right ring to 1 eV. Input 1 = 1; Input 2 = 0: left ring connected to 1 eV, right ring to 0.6 eV. Input 1 = 1; Input 2 = 1: both rings connected to 1 eV. Logic ‘0’ corresponds to 0.6 eV, and logic ‘1’ corresponds to 1 eV.

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