Subwavelength terahertz imaging via virtual superlensing in the radiating near field

Alessandro Tuniz () and Boris T. Kuhlmey
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Alessandro Tuniz: University of Sydney
Boris T. Kuhlmey: University of Sydney

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Imaging with resolutions much below the wavelength λ – now common in the visible spectrum – remains challenging at lower frequencies, where exponentially decaying evanescent waves are generally measured using a tip or antenna close to an object. Such approaches are often problematic because probes can perturb the near-field itself. Here we show that information encoded in evanescent waves can be probed further than previously thought, by reconstructing truthful images of the near-field through selective amplification of evanescent waves, akin to a virtual superlens that images the near field without perturbing it. We quantify trade-offs between noise and measurement distance, experimentally demonstrating reconstruction of complex images with subwavelength features down to a resolution of λ/7 and amplitude signal-to-noise ratios

Date: 2023
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DOI: 10.1038/s41467-023-41949-5

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