Negative-index bi-anisotropic photonic metamaterial fabricated by direct   laser writing and silver shadow evaporation
  We present the blueprint for a novel negative-index metamaterial. This structure is fabricated via three-dimensional two-photon direct laser writing and silver shadow evaporation. The comparison of measured linear optical spectra with theory shows good agreement and reveals a negative real part of the refractive index at around 3.85 micrometer wavelength - despite the fact that the metamaterial structure is bi-anisotropic due to the lack of inversion symmetry along its surface normal. 
Michael S. Rill, Christine Plet, Michael Thiel, Georg von Freymann,   Stefan Linden, and Martin Wegener