Dynamically Manipulating the Plasmon-Induced Transparency—Like in Asymmetric Graphene-Based Waveguide Structures

We perform a theoretical and numerical investigation of the process of plasmon-induced transparency (PIT)-like in an asymmetric graphene-based waveguide system with two identical graphene-ribbon resonators. PIT-like phenomenon can be produced by the resonance hybridization between two graphene ribbons with frequency detuning. The hybrid resonance and resonant frequency detuning come from the variation in the phase of propagation waves at resonances and the coupling interaction between ribbons. These variations are induced by shifting the lateral distance between the two ribbons. Moreover, the transparency window can be actively manipulated by adjusting the Fermi energy of graphene without reoptimizing and refabricating the structure. The proposed graphene-based PIT-like structure may result in the development of new compact elements such as tunable sensors, modulators, and switchers.