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Abstract
Terahertz (THz) frequency coders are indispensable components of broadband wireless communication systems of the future. However, the coding of THz wave at multiple frequencies is still a challenge. In this work, a 3 bit THz coder based on a graphene composite metasurface is proposed and simulated using a full-wave electromagnetic simulation software. The unit cell of the device consists of three graphene-embedded split-ring-resonators (SRRs), i.e., ${{\rm SRR}_1}$, ${{\rm SRR}_2}$, and ${{\rm SRR}_3}$. The device has three transmission peaks modulated by external voltages of ${V_1}$, ${V_2}$, and ${V_3}$. The central frequency of the peak generated by ${{\rm SRR}_1}$ locates at 0.864 THz and its maximum modulation depth is 79.6%. The second peak generated by ${{\rm SRR}_2}$ locates at 1.161 THz and has a maximum modulation depth of 87%. The third peak at 1.541 THz is produced by ${{\rm SRR}_3}$ and has a maximum modulation depth of 85.3%. More importantly, the device can be used as a 3 bit coder, and the codes of 111, 110, 101, 011, 100, 010, 001, and 000 are successfully realized by controlling the voltages of ${V_1}$, ${V_2}$ and ${V_3}$. The proposed device has potential applications in next-generation broadband wireless communications.
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