A recent analysis by Pendry [J. B. Pendry, Phys. Rev. Lett. 85, 3966 (2000)] shows that a dielectric slab with a dielectric constant ε=−1 can produce a perfect image in the electrostatic limit (c→∞), independent of the permeability μ, and therefore is a perfect lens. 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.

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