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Generation of highly directional beam by k-space filtering using a metamaterial flat slab with a small negative index of refraction

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3 Author(s)
Martinez, A. ; Valencia Nanophotonics Technology Center, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain ; Piqueras, Miguel A. ; Marti, J.

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The authors show how a flat slab made of a metamaterial engineered to have a small negative index of refraction can be used to reshape radiation emitted from an isotropic source and produce a highly directional output beam. The slab makes a filtering of high transverse wave vectors of the input diverging beam. The predicted phenomenon is demonstrated at microwave frequencies using a two-dimensional photonic crystal made of alumina rods. Simulations using the finite-difference time-domain method support the experiments.

Published in:

Applied Physics Letters  (Volume:89 ,  Issue: 13 )

Date of Publication:

Sep 2006

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