Bulk Negative Index Photonic Metamaterials for Direct Laser Writing
  We show the designs of one- and two-dimensional photonic negative index metamaterials around telecom wavelengths. Designed bulk structures are inherently connected, which render their fabrication feasible by direct laser writing and chemical vapor deposition. 
Durdu \"O. G\"uney, Thomas Koschny, Maria Kafesaki, and Costas M.   Soukoulis