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Imaging below the diffraction limit is always a public interest because ofthe restricted resolution of conventional imaging systems. To beat the limit,evanescent harmonics decaying in space must participate in the imaging process.Here, we introduce the method of spatial spectrum sampling, a novel far-fieldsuperresolution imaging method for microwave and terahertz regime. Strongdispersion and momentum conservation allow the spoof surface plasmon polaritons(SSP) structure to become a sensitive probe for spatial harmonics. This enablesthat the spatial information of the targets including both propagating andevanescent components, can be extracted by tuning and recording SSP in the farfield. Then, the subwavelength resolution is constructed by the inversedFourier transform of the sampled spatial spectrum. Using the modifiedsubwavelength metallic grating as the spoof plasmonic structure, a far-fieldresolution of 0.17 wavelength is numerically and experimentally verified, andtwo-dimensional imaging ability is also fully discussed. The imaging abilityand flexibility can be further optimizing the SSP structures. We are confidentthat our working mechanism will have great potentials in the superresolutionimaging applications in the microwave and terahertz frequency range

Far-field subwavelength resolution imaging by spatial spectrum sampling