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Related Concept Videos

Color Vision01:24

Color Vision

484
Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
484

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Spatially Selective Imaging in Color: What You See is What You Want.

John You En Chan1, Akshaya Rajesh1, Xiaoyu Lin1

  • 1Engineering Product Development, Singapore University of Technology and Design, Singapore, 487372, Singapore.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 28, 2024
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Summary

Spatially selective imaging (SSI) decodes multiple images from a single encoded print using off-axis Fresnel lens arrays. This technique enables optical information security applications by retrieving images with acceptable color contrast.

Keywords:
fresnel lensesimagingmultiplexingstructural colorstwo photon polymerization

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Information Security

Background:

  • Spatially selective imaging (SSI) reconstructs images by sampling pixels from different positions.
  • Current SSI methods require complex optical setups or specific encoding schemes.
  • Structural color pixels offer a compact and versatile platform for optical encoding.

Purpose of the Study:

  • To demonstrate a novel SSI technique using off-axis cylindrical Fresnel lens arrays.
  • To investigate the feasibility of decoding multiple images from structural color pixels.
  • To analyze the performance of Fresnel lenses in imaging broadband structural color.

Main Methods:

  • Fabrication of off-axis cylindrical Fresnel lens arrays and structural color pixels via two-photon polymerization.
  • Optical retrieval of multiple images by sequentially applying different pseudorandom lens key configurations.
  • Digital reconstruction and analysis of the decoded images, including color contrast and modulation transfer function (MTF).

Main Results:

  • Successful decoding of multiple images from a single encoded print of structural color pixels.
  • Demonstrated imaging of structural color pixels across a wide spectrum using low numerical aperture (NA ≈0.2) Fresnel lenses.
  • Achieved acceptable color contrast with a simulated average MTF of ≈0.6 across the visible spectrum, despite potential chromatic aberrations.

Conclusions:

  • Off-axis Fresnel lens arrays provide a viable method for implementing spatially selective imaging.
  • The developed SSI technique is suitable for applications involving structural color pixels.
  • This approach shows promise for advanced optical information security devices.