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Evanescent wave amplification is observed, for the first time to ourknowledge, inside a half-wavelength-thick wire medium slab used forsubwavelength imaging. The wire medium is analyzed using both a spatiallydispersive finite-difference time-domain (FDTD) method and a full-wavecommercial electromagnetic simulator CST Microwave Studio. In this work wedemonstrate that subwavelength details of a source placed at a distance ofone-tenth of a wavelength from a wire medium slab can be detected inside theslab with a resolution of approximately one-tenth of a wavelength in spite ofthe fact that they cannot be resolved at the front interface of the device, dueto the rapid decay of evanescent spatial harmonics in free space.

Subwavelength internal imaging by means of the wire medium