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Subwavelength terahertz imaging via virtual superlensing in the radiating near field

Author

Listed:
  • Alessandro Tuniz

    (University of Sydney
    The University of Sydney Nano Institute, The University of Sydney)

  • Boris T. Kuhlmey

    (University of Sydney
    The University of Sydney Nano Institute, The University of Sydney)

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

Suggested Citation

  • Alessandro Tuniz & Boris T. Kuhlmey, 2023. "Subwavelength terahertz imaging via virtual superlensing in the radiating near field," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-41949-5
    DOI: 10.1038/s41467-023-41949-5
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    References listed on IDEAS

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    1. Junsuk Rho & Ziliang Ye & Yi Xiong & Xiaobo Yin & Zhaowei Liu & Hyeunseok Choi & Guy Bartal & Xiang Zhang, 2010. "Spherical hyperlens for two-dimensional sub-diffractional imaging at visible frequencies," Nature Communications, Nature, vol. 1(1), pages 1-5, December.
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