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Area of Science:

  • Optics and Photonics
  • Biomedical Imaging
  • Materials Science

Background:

  • Conventional tomography relies on mechanical scanning, limiting system compactness and stability.
  • Developing non-mechanical tomography is crucial for advanced, compact imaging systems.
  • Limited depth-of-field (DOF) in traditional systems necessitates new approaches.

Purpose of the Study:

  • To propose and demonstrate a novel non-motion tomography system using a metalens.
  • To leverage spectral imaging and a metalens for optical zooming and focus tuning.
  • To achieve high-resolution 3D imaging of microscopic biological samples.

Main Methods:

  • Utilized an aplanatic Gallium Nitride (GaN) metalens with a high numerical aperture (NA = 0.78).
  • Employed large chromatic dispersion for spectral focus tuning and optical zooming in the visible spectrum.
  • Confirmed functionality on cascaded samples and imaged microscopic frog egg cells.

Main Results:

  • Successfully demonstrated wavelength-switched tomography.
  • Obtained excellent tomographic images of frog egg cells, resolving cell membrane and nucleus features.
  • Showcased distinct depth-of-field (DOF) characteristics in the tomographic images.

Conclusions:

  • The proposed metalens-based spectral imaging system offers a non-mechanical approach to tomography.
  • This technique effectively utilizes the diffractive dispersion of metalenses for advanced imaging.
  • The developed imaging method represents a significant advancement for informative optical devices.