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We show that a metamaterial consisting of aligned metallic nanowires in adielectric matrix has strongly anisotropic optical properties. For fillingratio f<1/2, the composite medium shows two surface plasmon resonances (SPRs):the transverse and longitudinal SPR with wavelengths lambda_t<lambda_l. Forlambda>lambda_l, the longitudinal SPR, the material exhibits Re epsilon_l<0, Reepsilon_t>0, relative to the nanowires axis, enabling the achievement ofbroadband all-angle negative refraction and superlens imaging. An imagingtheory of superlens made of these media is established. High performancesystems made with Au, Ag or Al nanowires in nanoporous templates are designedand predicted to work from the infrared up to ultraviolet frequencies.

Superlens imaging theory for anisotropic nanostructured metamaterials with broadband all-angle negative refraction