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Negative index from asymmetric metallic cut wire pairs metamaterials

Published online by Cambridge University Press:  19 January 2010

Shah Nawaz Burokur  and
André de Lustrac
Shah Nawaz Burokur*
Affiliation:
IEF, Univ. Paris-Sud, CNRS, UMR 8622, 91405 Orsay Cedex, France.
André de Lustrac
Affiliation:
IEF, Univ. Paris-Sud, CNRS, UMR 8622, 91405 Orsay Cedex, France.
*
Corresponding author: S.N. Burokar Email: sburokur@u-paris10.fr
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Abstract

Metamaterials made of exclusively metallic cut wire pairs have been experimentally demonstrated to exhibit a negative refractive index at optical frequencies. However, other related works on slightly different wire and plate pairs have not shown a negative index. In this paper, we present the analogy between previously reported S-shaped metamaterials and asymmetric cut wire pairs by a simple unifying approach. These two structures present a negative index for some geometrical configurations. Using simulations and experimental measurements in the microwave domain, we investigate the material properties of the last structure. Applying the inversion method from transmission and reflection responses, we show that a negative index is exhibited due to simultaneous negative permittivity ε and permeability μ. A negative index n is experimentally verified in a bulk prism engineered by stacking several layers of the metamaterial.

Keywords

MetamaterialsCut wire pairsSymmetry breakingEffective mediumNegative refractive index
Type
Original Article
Information
International Journal of Microwave and Wireless Technologies , Volume 1 , Special Issue 6: 2009 National Microwave Days in France , December 2009 , pp. 521 - 527
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2010

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