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All-optical complex field imaging using diffractive processors.

Jingxi Li1,2,3, Yuhang Li1,2,3, Tianyi Gan1,3

  • 1Electrical and Computer Engineering Department, University of California, Los Angeles, CA, 90095, USA.

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This summary is machine-generated.

Researchers developed a novel complex field imager for snapshot amplitude and phase imaging. This diffractive optical device bypasses digital processing for direct quantitative phase and amplitude measurements.

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Area of Science:

  • Optics and Photonics
  • Computational Imaging

Background:

  • Conventional image sensors capture intensity only, not phase information.
  • Existing phase retrieval methods require complex hardware and extensive computation.
  • Complex field imaging offers detailed sample insights like refractive index distributions.

Purpose of the Study:

  • To develop a compact optical system for snapshot complex field imaging.
  • To enable direct measurement of both amplitude and quantitative phase using intensity-based sensors.
  • To eliminate the need for digital reconstruction algorithms in complex field imaging.

Main Methods:

  • Designed a compact optical system with successive deep learning-optimized diffractive surfaces.
  • Implemented two independent imaging channels for amplitude-to-amplitude and phase-to-intensity transformation.
  • Utilized an intensity-based sensor array for direct output measurement.

Main Results:

  • Achieved snapshot imaging of both amplitude and quantitative phase information.
  • Demonstrated direct correlation between output intensity distributions and input field profiles.
  • Experimentally validated the design with 3D-printed prototypes in the terahertz spectrum.

Conclusions:

  • The proposed diffractive imager enables direct, computationally free complex field imaging.
  • The compact design and snapshot capability offer significant advantages over conventional methods.
  • Potential applications span security, biomedical imaging, sensing, and material science.