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Metallic double-ring metamaterial without splits in both of the rings was recently studied to show its negative refraction with magnetic resonance [Z.-G. Dong et al., Appl. Phys. Lett. 92, 064101 (2008)]. As a consequent work, systematic numerical results are presented in this paper to investigate the dependence of the magnetically resonant transmission on the structural parameters. The origin of the transmission band with magnetic resonance is shown rather explicitly with these numerical results. In addition, the optimized structure of the double-ring metamaterial is used to explore its terahertz response with all the sizes scaled down simultaneously. [ABSTRACT FROM AUTHOR]

Abstract: Graphene can be used as a platform for transformation-optics devices due to its tunability of conductivity. Besides conductivity, we show that the loss of graphene can also be controlled. Using this priority and taking the advantage of transformation optics, we realize the concept of electromagnetic “black hole” by using of a single-layer graphene. Numerical simulations demonstrate that the surface plasmon polariton waves incident to the “black hole” are bent towards the central area and absorbed by the inner core. The advantages of graphene-based “black hole” are its planar, isotropic, and nonmagnetic characteristics. [Copyright &y& Elsevier]