Abstract
In this paper, a triple-band hybridization coherent perfect absorber based on graphene metamaterial is proposed, which consists of graphene concentric nanorings with different sizes and a metallic mirror separated by SiO2 layer. Based on the finite-difference time-domain (FDTD) solution, triple-band coherent perfect absorption is achieved at frequencies from 0.6 THz to 1.8 THz, which results from the surface plasmon resonance hybridization. The wavelength of the absorption peak can be rapidly changed by varying the Fermi level of graphene. Most importantly, the wavelength of the absorption peak can be independently tuned by varying the Fermi level of the single graphene nanoring. Moreover, the triple hybridization perfect absorber is angle-insensitive because of the perfect symmetry structure of the graphene nanorings. Therefore, our results may widely inspire optoelectronic and micro-nano applications, such as cloaking, tunable sensor, etc.
Highlights
Metamaterials have unique advantages for the regulation of electromagnetic waves
When the electromagnetic wave illuminates the device, the surface plasmon polarization (SPP) is excited on the top graphene layer and the redundant energy in the absorber was reflected by the bottom perfect electrical conductor (PEC) mirror, resulting in strong magnetic resonance [44,45,46,47]
Earlier works [22,25,48,49] showed that a local surface plasma mode or a gap plasma mode illuminated by incident light will be excited inside the graphene microstructure, resulting in a significant enhancement of light absorption
Summary
Metamaterials have unique advantages for the regulation of electromagnetic waves. It is a powerful structure formed by the periodic arrangement of many micro-nano structures, such as concentric rings [1,2], nano-rods [3,4] and the metal split-ring resonators [5,6]. The work based on metamaterials has promoted the development of many functional devices, such as optic cloaks [8,9], sensors [10], optical switches [11] and so on. Most of these proposed MPAs still have a strict working bandwidth. It is hard to change the structure in integrated devices
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