Optical negative-index bulk metamaterials consisting of 2D perforated metal-dielectric stacks

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Abstract
Numerical simulations of a near-infrared negative-index metama-terial (NIM) slab consisting of multiple layers of perforated metal-dielectric stacks exhibiting a small imaginary part of the index over the wavelength range for negative refraction are presented. A consistent effective index is obtained using both scattering matrix and modal analysis approaches. Backward phase propagation is verified by calculation of fields inside the metamaterial. The NIM figure of merit, [-Re(n)/Im(n)], for these structures is improved by ~ 10× compared with previous reports, establishing a new approach to thick, low-loss metamaterials at infrared and optical frequencies.

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