3D Isotropic High Index Interleaved Metamaterials Realized by Additive Manufacturing

An arrangement of three-dimensionally isotropic high index metamaterials composed of modified metallic crosses that are extended beyond a single unit cell to form an interleaved configuration with the arms of the crosses from all adjacent unit cells is developed. It is shown that at greater degrees of interleaving of the cross elements the metamaterials exhibit increasingly larger effective refractive indices at increasing miniaturization of the unit cell. The symmetry of the structure ensures that a polarization and propagation angle insensitive effective index is attained. Fabrication of the metamaterial is addressed by fused filament fabrication (FFF) 3D printing.