Far-field high-resolution imaging of conducting obstacles using metamaterial-lined aperture arrays

This work offers a new mechanism for far-field high-resolution imaging based on illumination by a one-dimensional array of subwavelength resonant apertures lined using epsilon-negative and near-zero (ENNZ) metamaterials. Each aperture in the array exhibits a fano-like transmission resonance-antiresonance profile, and the resonance frequencies of adjacent apertures are adjusted so that the resonance of one lies within the antiresonance of the other, to ensure strong isolation. This approach enables each resonance peak to be uniquely associated with one location in space. We show that blocking an aperture using a conducting disk suppresses the corresponding resonance frequency, enabling far-field imaging of a distribution of obstacles with a spatial resolution of better than λ/6.