Subwavelength metamaterial-lined apertures AS far-field imaging devices

Abstract

This work offers experimental verification of a new mechanism for far-field high-resolution imaging of conducting obstacles using a near-field probe that employs a non-uniform one-dimensional array of subwavelength resonant apertures. The miniaturization of apertures is achieved by lining them using metamaterials. This probe is shown to be capable of magnifying subwavelength features to the far-field spectrum by mapping each aperture location to a particular resonance frequency. It is experimentally shown that this device enables far-field imaging of conducting obstacles as small as λ/8 separated by as little as λ/6.