This work is concerned with the experimental demonstration of a dual-band negative index metamaterial. The sample is double negative (showing both a negative effective permeability and a negative effective permittivity) for linearly polarized light with a wavelength between 799 and $818\mathrm{nm}$ , and the real part of its refractive index is approximately $-1.0$ at $813\mathrm{nm}$ . The ratio of $-\mathrm{Re}\left(n\right)∕\mathrm{Im}\left(n\right)$ is close to 1.3 at $813\mathrm{nm}$ . For an orthogonal polarization, the same sample also exhibits a negative refractive index in the visible (at $772\mathrm{nm}$ ). The spectroscopic measurements of the material are in good agreement with the results obtained from a finite-element electromagnetic solver for the actual geometry of the fabricated sample at both polarizations.

© 2007 Optical Society of America

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