Low-index metamaterial designs in the visible spectrum

Metamaterial filter for the near-visible spectrum

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

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....

Dual-band, double-negative, polarization-independent metamaterial for the visible spectrum

We present what is to our knowledge the first dual-band negative index metamaterial that operates in the visible spectrum. The optimized four-functional-layer metamaterial structure exhibits the first double-negative (i.e., simultaneously negative permittivity and permeability) band in the red region of the visible spectrum with a figure of merit of 1.7 and the second double-negative band in th...

Low-loss negative-index metamaterial at telecommunication wavelengths.

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 refract...

Stochastic optimization of low-loss optical negative-index metamaterial