Nonlocal effects on the imaging properties of a silver superlens

The imaging properties of a near field lens made of a thin silver slab are evaluated. The effects of nonlocality on the optical response of the slab are expressed in terms of the Feibelman d parameters. Numerical results are presented employing the d parameters derived from two versions of the time dependent local density approximation: standard jellium model, and a two component s-d electron system model. Results obtained from the local approximation, as well as from the nonlocal hydrodynamic model, are also presented for comparison.