title: Intra-connected three-dimensionally isotropic bulk negative index photonic metamaterial.
abstract: Isotropic negative index metamaterials (NIMs) are highly desired, particularly for the realization of ultra-high resolution lenses. However, existing isotropic NIMs function only two-dimensionally and cannot be miniaturized beyond microwaves. Direct laser writing processes can be a paradigm shift toward the fabrication of three-dimensionally (3D) isotropic bulk optical metamaterials, but only at the expense of an additional design constraint, namely connectivity. Here, we demonstrate with a proof-of-principle design that the requirement connectivity does not preclude fully isotropic left-handed behavior. This is an important step towards the realization of bulk 3D isotropic NIMs at optical wavelengths.
authors.affiliation: Ames National Laboratory, USDOE and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA. dguney@ameslab.gov
authors.forename: Durdu O
authors.initials: DO
authors.lastname: Güney
authors.forename: Thomas
authors.initials: T
authors.lastname: Koschny
authors.forename: Costas M
authors.initials: CM
authors.lastname: Soukoulis