Numerical investigation of negative refractive index metamaterials at infrared and optical frequencies

Abstract An analysis of the transmission properties of a slab of metallic split-ring resonators at near infrared and optical frequencies is presented. We focus on the influence of the parameters characterizing the intrinsic frequency dispersion of the metallic rings on the physical properties of recently introduced materials that exhibit a negative refractive index. It is demonstrated that, when a mesh of thin metallic wires is added, at the resonant frequency ω 0 ∼150 THz the refractive index of the resulting metamaterial is negative within a frequency band ▵ ω ∼50 THz. The numerical analysis is performed using the transfer matrix formalism.

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