Tunable, polarization-dependent multi-band perfect metamaterial absorber based on single layer mickey-like patterned graphene

This paper proposes and investigates a polarization-dependent multi-band perfect absorber composed of mickey-like patterned graphene. Simulation results demonstrate three perfect absorption peaks at 24.62 μm, 31.16 μm, and 65.12 μm with maximal absorbance of 96.6%, 98.8%, and 99.1% respectively, for instance, when an incident y-polarized wave is taken. A hybrid combination of the two ear and face structures effectively enhances and improves the absorption performance. This is evidenced by a step-by-step spectrum analysis of each decomposed and synthesized component, as well as an analysis of electric field coupling and impedance matching theory. Further investigation of the device's performance reveals that it is largely insensitive to incident angles (up to 30°), but is significantly affected by polarization angles due to the characteristic asymmetric properties of the structure along the x axis. The absorption peaks can be dynamically tuned by adjusting the effective parameters of graphene, the permittivity of the dielectric material, and the refractive index of its surroundings. Based on polarization related modulation mechanism, such graphene surface plasmon resonance (GSPR) induced device has potential applications in polarized light filtering, differentiation of dielectric materials, and sensing of surrounding refractive indices.