Subwavelength terahertz imaging via virtual superlensing in the radiating near field.

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

SUBMITTER: Tuniz A 

PROVIDER: S-EPMC10584837 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature