Near Field Imaging With Negative Dielectric Constant Lenses

A recent analysis of Pentry shows that a dielectric slab with a dielectric constant $epsilon = -1$ and permeability $mu = +1$ behaves like a perfect lens in the electrostatic limit $(c -> infinity$). Here we include retardation effects and show how distance and dissipation make the lens no longer perfect. Nevertheless we conclude that very significant improvements over conventional near field imaging may be obtained in the microwave regime.