Amplification of evanescent spatial harmonics and subwavelength imaging inside of a wire medium slab

The amplification of evanescent spatial harmonics has been observed inside of a wire medium slab with half- wavelength thickness. The physics of the phenomenon are drastically different as compared to the amplification observed for the slabs of left-handed media. The slab of wire medium has been modeled using spatially dispersive finite-difference time- domain method. The opportunity of subwavelength imaging was revealed. It is shown that the near field produced by an object placed at the distance less than lambda/10 from the front interface of the device can be detected inside of the wire medium slab with resolution about lambda/20. The resolved subwavelength details of the source absent at the front interface of the wire medium due to rapid decay of evanescent spatial harmonics the free space, but they happens to be resolved inside of the wire medium slab. The reported effect may be used for sub-surface imaging and creation of subwavelength imaging devices of new generation.