Abstract
It is necessary to explore the potential applications of surface plasmon polaritons (SPPs) on graphene metasurfaces and enhance the performance of their on–off modulators and slow‐light effect. A simple monolayer graphene metasurface is developed for achieving the plasmon‐induced transparency (PIT) phenomenon in the terahertz range. PIT can be effectively tuned by the positional parameter, the Fermi level, and the carrier mobility using the finite‐difference time‐domain (FDTD). Moreover, it is found that a quad‐frequency on–off modulator and an outstanding slow‐light effect can be realized in this proposed metasurface. Interestingly, modulation depth (MD), insertion loss (IL), ΔT, and the group index are of 98.90%, ≈0.05 dB, 0.97, and 3383, respectively. Hence, the results show that the proposed metasurface has excellent performance for on–off modulators and a slow‐light effect, which can provide theoretical guidance for designing terahertz micro‐nanophotonic devices.
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