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We show that subwavelength imaging by negative index materials (NIM), relatedto their "soft" electromagnetic response, is very (and non trivially) sensitiveto the surface properties. A minute deviation of dielectric permittivityepsilon or magnetic permeability mu from the ideal values epsilon = mu = -1 inthin surface layer(s) results in drastic reduction of the resolution limit of aNIM slab. There may be a gap in the polariton spectrum and this would allowestablishment of a stationary regime even without losses.Comment: 4 pages, 1 figure, (v2) minor changes in tex

Strong effect of surfaces on resolution limit of negative-index “superlens”