We propose a design for a plasmonic copper metamaterial with a negative index of refraction at visible/near-infrared wavelengths. Using numerical simulations, we demonstrate negative refraction by a copper metamaterial prism and perform a parameter extraction technique to verify the sign of the effective, electric permittivity and magnetic permeability. Our proposed design has a figure of merit comparable to similar silver-based metamaterials operating in the visible/near-infrared range. These findings have implications for the design of low cost plasmonic devices and negative-index metamaterials in the visible/near-infrared.

Appl. Phys. Lett.
Photonic Materials

Parsons, J., & Polman, A. (2011). A copper negative index metamaterial in the visible / neear infrared. Appl. Phys. Lett., 99(16, Article number: 161108), 1–3. doi:10.1063/1.3654149