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We investigate theoretically and numerically the photonic band structure inthe optical domain of an array of core-shell metal-semiconductor nanowires.Corresponding negative-index photonic bands are calculated, showing isotropicequifrequency surfaces. The effective (negative) electric permittivity andmagnetic permeability, retrieved from S parameters, are used to compare theperformance of such nanowire arrays with homogeneous media in canonicalexamples, such as refraction through a prism and flat-lens focusing. Very goodagreement is found, indeed confirming the effective medium behavior of thenanowire array as a low-loss, isotropic (2D) and bulk, optical negative indexmetamaterial. Indeed, disorder is introduced to further stress its robustness

journal of optics

Photonic band structure and effective medium properties of  doubly-resonant core-shell metallo-dielectric nanowire arrays: low-loss,  isotropic optical negative-index behavior