Independently Tunable Multipurpose Absorber with Single Layer of Metal-Graphene Metamaterials

Chen Han,Min Hu,Renbin Zhong,Diwei Liu,Yiqing Wang,Zheng Fang,Long Yang,Zhenhua Wu,Shenggang Liu,Zekun Liang,Anchen Ma

doi:10.3390/ma14020284

Chen Han, Min Hu + Show 9 more

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https://doi.org/10.3390/ma14020284

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Abstract

This paper reports an independently tunable graphene-based metamaterial absorber (GMA) designed by etching two cascaded resonators with dissimilar sizes in the unit cell. Two perfect absorption peaks were obtained at 6.94 and 10.68 μm with simple single-layer metal-graphene metamaterials; the peaks show absorption values higher than 99%. The mechanism of absorption was analyzed theoretically. The independent tunability of the metamaterial absorber (MA) was realized by varying the Fermi level of graphene under a set of resonators. Furthermore, multi-band and wide-band absorption were observed by the proposed structure upon increasing the number of resonators and resizing them in the unit cell. The obtained results demonstrate the multipurpose performance of this type of absorber and indicate its potential application in diverse applications, such as solar energy harvesting and thermal absorbing.

Highlights

Metamaterials are a type of artificially engineered electromagnetic material composed of periodically arranged sub-wavelength elements
Achieving dynamically and independently tunable graphene-based metamaterial absorbers (GMAs) with a simple design to improve the performance of energy-absorbing structures has been one of the mos that multilayer metamaterials can exhibit multiple absorption bands, and the peaks can be important research topics in the recent past
All these results indicate thatofthe structure be widelyinused in solar rayperiodic harvesting and thermal absorbing.graphene ribbons, the insulated dielectric layer, and gold arrays of metallic resonators, substrate are tightly stacked from top to bottom

Summary

Introduction

Metamaterials are a type of artificially engineered electromagnetic material composed of periodically arranged sub-wavelength elements They exhibit excellent properties and applications such as negative refractive index [1], optical stealth [2], perfect lens imaging [3], and perfect optical absorption [4]. Previous studies have found that multilayer metamaterials can exhibit multiple absorption bands, and the peaks can be tuned independently by adjusting the parameters of a certain layer, but this will require a more complex design and increase fabrication difficulties [21,22,23]. Achieving dynamically and independently tunable graphene-based metamaterial absorbers (GMAs) with a simple design to improve the performance of energy-absorbing structures has been one of the mos that multilayer metamaterials can exhibit multiple absorption bands, and the peaks can be important research topics in the recent past

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