Negative refraction in graphene-based hyperbolic metamaterials

被引：132
|
作者：
Sreekanth, K. V. [1 ]
De Luca, A. [2 ]
Strangi, G. [1 ,2 ]
机构：
[1] Case Western Reserve Univ, Dept Phys, Cleveland, OH 44106 USA
[2] CNR IPCF UOS Cosenza, Licryl Lab, Dept Phys, I-87036 Arcavacata Di Rende, Italy
来源：
APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 02期
关键词：
D O I：
10.1063/1.4813477
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Here, we numerically investigate the existence of negative group refraction in graphene-based hyperbolic metamaterials (HMM) at THz frequencies. The hyperbolic dispersion of the graphene-based HMM can be tuned by varying the chemical potential and surrounding dielectric layer thickness. The negative group and positive phase indices of refraction are observed for oblique incidence at far below the critical frequency, which permits negative energy refraction and forward wavefront propagation. The highly confined bulk plasmon modes are also observed in the negative group index region that further evidence the negative refraction behaviour of the graphene-based hyperbolic metamaterials. (C) 2013 AIP Publishing LLC.
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页数：4
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