Several alternative possibilities of how to create an electromagnetic devicebeing able to reconstruct near-field distribution of a source withsub-wavelength resolution (so-called perfect lens) are considered. It is shownthat there is a variety of such means not involving double-negative(left-handed, or Veselago) materials or periodical backward-wave structures. Itis demonstrated that devices working in a similar manner can be constructedusing planar grids or material sheets imposing necessary boundary conditions attwo parallel planes in air.
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