Energy considerations for a superlens based on metal/dielectric   multilayers
  We investigate the resolution and absorption losses of a Ag/GaP multilayer superlens. For a fixed source to image distance the resolution is independent of the position of the lens but the losses depend strongly on the lens placement. The absorption losses associated with the evanescent waves can be significantly larger than losses associated with the propagating waves especially when the superlens is close to the source. The interpretation of transmittance values greater than unity for evanescent waves is clarified with respect to the associated absorption losses. 
Mark Bloemer, Giuseppe D'Aguanno, Michael Scalora, Nadia Mattiucci,   Domenico de Ceglia