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Opt Express. 2010 Jun 7;18(12):12348-53. doi: 10.1364/OE.18.012348.

Intra-connected three-dimensionally isotropic bulk negative index photonic metamaterial.

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  • 1Ames National Laboratory, USDOE and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA.


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.

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