Broadband graphene-based metamaterial absorbers

In this paper, a new type of broadband tunable metamaterial absorber is proposed. The structure consists of a single-layer ring graphene and a metal ground plane separated by a dielectric spacer. The graphene rings are connected each other to be easily tuned by the voltage. In addition, this absorbe...

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Bibliographic Details
Published in:	AIP advances 2018-01, Vol.8 (1), p.015301-015301-7
Main Authors:	Liu, Chang, Qi, Limei, Zhang, Xu
Format:	Article
Language:	eng
Subjects:	Absorbers (materials) Absorption Broadband Graphene Ground plane Impedance matching Metamaterials Ring structures Unit cell
Online Access:	Get full text
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Summary:	In this paper, a new type of broadband tunable metamaterial absorber is proposed. The structure consists of a single-layer ring graphene and a metal ground plane separated by a dielectric spacer. The graphene rings are connected each other to be easily tuned by the voltage. In addition, this absorber is polarization-independent at normal incidence due to the symmetric pattern of the unit cell. Results reveal the bandwidth of 90% absorption reaches to 2.25 THz for a single-ring structure. The bandwidth of 90% absorption increases to 3.2 THz by combining two similar rings with different sizes in one unit cell. The physical mechanism of the single-ring and dual-ring absorbers are given based on the impedance matching theory.
ISSN:	2158-3226 2158-3226