Loss enhanced transmission and collimation in anisotropic   epsilon-near-zero metamaterials
  We verify the extraordinary transmission enhancement and collimation induced by the material loss in anisotropic near-zero permittivity (ENZ) metamaterials, and reveal the physical mechanism of this exotic electromagnetic phenomenon via the iso-frequency contour (IFC) analysis. In addition, we demonstrate the possibility in realization of such loss enhanced transmission of Gaussian beam in realistic silver-germanium multilayered structures by applying full-wave numerical simulations. 
Lei Sun, Simin Feng, and Xiaodong Yang
physics.optics