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Opt Lett. 2006 Jun 15;31(12):1800-2.

Low-loss negative-index metamaterial at telecommunication wavelengths.

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Institut für Angewandte Physik, Universität Karlsruhe, TH, Wolfgang-Gaede-Strass 1, D-76131 Karlsruhe, Germany.


We fabricate and characterize a low-loss silver-based negative-index metamaterial based on the design of a recent theoretical proposal. Comparing the measured transmittance and reflectance spectra with theory reveals good agreement. We retrieve a real part of the refractive index of Re(n)= -2 around 1.5 microm wavelength. The maximum of the ratio of the real to the imaginary part of the refractive index is about three at a spectral position where Re(n)= -1. To the best of our knowledge, this is the best figure of merit reported for any negative-index photonic metamaterial to date.


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