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Reversed rainbow with a nonlocal metamaterial

Morgado, T. A. ; Marcos, J. ; Costa, J. ; Costa, J.R. ; Fernandes, C. A. ; Silveirinha, M. G.

Applied Physics Letters Vol. 105, Nº 264101 , pp. 1 - 4, December, 2014.

ISSN (print): 0003-6951
ISSN (online): 0003-6951

Journal Impact Factor: 3,726 (in 2008)

Digital Object Identifier: 10.1063/1.4905152

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Abstract
One of the intriguing potentials of metamaterials is the possibility to realize a nonlocal electromagnetic reaction, such that the effective medium response at a given point is fundamentally entangled with the macroscopic field distribution at long distances. Here, it is experimentally and numerically verified that a microwave nonlocal metamaterial formed by crossed metallic wires enables a low-loss broadband anomalous material response such that the refractive index decreases with frequency. Notably, it is shown that an electromagnetic beam refracted by our metamaterial prism creates a reversed microwave rainbow.