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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Biomedical Imaging

Background:

  • Mobile devices require compact, high-performance imaging systems.
  • Metalenses offer an alternative to traditional lenses but face manufacturing challenges.
  • High-aspect-ratio nanostructures increase cost and reduce yield in metalens fabrication.

Purpose of the Study:

  • To propose an infrared metalens design that reduces nanostructure aspect ratio.
  • To demonstrate that reduced nanostructure height does not compromise metalens performance.
  • To develop a compact eye imaging system for gaze tracking and iris authentication.

Main Methods:

  • Designed an infrared metalens with a wide field of view and reduced nanostructure aspect ratio.
  • Utilized a phase modulation depth of 4π/3, two-thirds of conventional designs.
  • Integrated the metalens into a prototype compact eye imaging system.

Main Results:

  • Achieved a 120-degree field of view with the metalens system.
  • Demonstrated reduced nanostructure height without performance degradation.
  • Developed an ultracompact eye camera module with a total track length of 1.758 mm.

Conclusions:

  • The proposed metalens design overcomes manufacturing limitations for commercial adoption.
  • The compact eye imaging system is suitable for gaze tracking and iris authentication.
  • This technology has significant potential for commercialization in extended reality devices.