Dual-band double-negative-index fishnet metamaterial at millimeter-waves

This paper was published in OPTICS LETTERS and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/OL.36.004245. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.[EN] An effective negative refractive index (NRI) is demonstrated and experimentally verified for the first two propagation bands of a fishnet-like metamaterial at millimeter-wave frequencies. The dual-band NRI behavior is achieved by engineering the diffraction order (±1, ±1) associated with the internal mode supported between holey layers to correspond with the second propagation band. In addition to the experimental interferometric technique that accounts for the handedness of the propagation, numerical results are given to predict the dual-band effective NRI and to confirm dual-band negative refraction for a prism composed of the proposed metamaterial. © 2011 Optical Society of America.Authors are grateful to R. Ortuno and F. J. Rodriguez-Fortuo (Valencia Nanophotonics Technology Center) for their helpful comments, to G. Crespo (Universidad Publica de Navarra) for sample fabrication, and to S. Hanham and A. Demetriadou (Imperial College London) for improving the readability of this Letter. Work supported by Spanish Government and European Union (EU) funds under contracts Consolider "Engineering Metamaterials" CSD2008-00066, TEC2008-06871-C02, and Valencian Government (contract PROMETEO-2010-087). M. N.-C. acknowledges financial support from Leverhulme Trust. C. 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