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Phys Rev Lett. 2011 Feb 11;106(6):067402. Epub 2011 Feb 11.

Low-loss multilayered metamaterial exhibiting a negative index of refraction at visible wavelengths.

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  • 1Nanophotonics Technology Center, Universidad Politécnica de Valencia, 46022 Valencia, Spain.


We experimentally demonstrate a low-loss multilayered metamaterial exhibiting a double-negative refractive index in the visible spectral range. To this end, we exploit a second-order magnetic resonance of the so-called fishnet structure. The low-loss nature of the employed magnetic resonance, together with the effect of the interacting adjacent layers, results in a figure of merit as high as 3.34. A wide spectral range of negative index is achieved, covering the wavelength region between 620 and 806 nm with only two different designs.

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