Abstract
A multiple plasmon-induced transparency (PIT) device operated in the mid-infrared region has been proposed. The designed model is comprised of one graphene ribbon as main waveguide and two narrow graphene sheets resonators. The phase coupling between two graphene resonators has been investigated. The multimode PIT resonances have been found in both cases and can be dynamically tuned via varying the chemical potential of graphene resonators without optimizing its geometric parameters. In addition, this structure can get multiple PIT effect by equipping extra two sheets on the symmetric positions of graphene waveguide. The simulation results based on finite element method (FEM) are in good agreement with the resonance theory. This work may pave new way for graphene-based thermal plasmonic devices applications.
Highlights
Surface plasmon polaritons (SPPs), coupled modes of plasmons and photons, propagate along the metal-dielectric interface [1, 2]
The most of plasmonically induced transparency (PIT) effects are based on MIM structure, and the adjustment of PIT effects must rely on changing the geometrical parameter of structures
We have proposed and investigated a PIT device operating in the mid-infrared region
Summary
Surface plasmon polaritons (SPPs), coupled modes of plasmons and photons, propagate along the metal-dielectric interface [1, 2]. SPPs provide an intriguing approach to localize and guide light in subwavelength metallic structures. A great variety of efforts have been devoted to applications based on SPPs, which promotes the development for high density integration of photonic circuits. A novel analogy phenomenon to EIT, known as plasmonically induced transparency (PIT), has been manifested in various systems based on metamaterial structures [5,6,7,8,9,10,11,12]. The PIT effect has been applied in various applications such as nonlinear optical processes, ultrafast switching, slow light, and signal processing [13, 14].
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