Enhancement of evanescent waves inside media with extreme optical   anisotropy
  Significant enhancement of evanescent spatial harmonics inside the slabs of media with extreme optical anisotropy is revealed. This phenomenon results from the pumping of standing waves and has the feature of being weakly sensitive to the material losses. Such characteristics may enable subwavelength imaging at considerable distances away from the objects. 
Pavel A. Belov, Yan Zhao, Yang Hao, Clive Parini