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 negati ... [Appl. Phys. Lett. 103, 023107 (2013)] published Wed Jul 10, 2013.
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