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Fischer Projections02:18

Fischer Projections

Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...
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Non-invasive 3D-Visualization with Sub-micron Resolution Using Synchrotron-X-ray-tomography
08:51

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Published on: May 27, 2008

Full-color 3D visualization with Janus metafiber.

Haotian Xu1, Tianyue Li2, Haotian Ding1

  • 1National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, School of Physics, Nanjing University, Nanjing, China.

Nature Communications
|June 8, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces the Janus metafiber system, a novel fiber imaging tool. It achieves both 2D imaging and 3D depth sensing simultaneously, enhancing applications in diagnostics and inspection.

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Area of Science:

  • Optics and Photonics
  • Biomedical Imaging
  • Metasurface Technology

Background:

  • Fiber endoscopic imaging systems offer high precision but struggle with depth and angle information.
  • Conventional dual-function imaging requires complex optical components.
  • Metasurfaces offer novel optical functionalities integrated with existing technologies.

Purpose of the Study:

  • To develop a single, integrated system for simultaneous 2D imaging and 3D depth sensing using fiber optics.
  • To overcome the limitations of traditional fiber imaging systems in acquiring depth information.
  • To leverage metasurface technology for enhanced fiber imaging capabilities.

Main Methods:

  • Proposed a Janus metafiber system integrating metasurfaces with fiber bundles.
  • Utilized a single round-trip optical path with forward and reverse switching.
  • Employed time-division acquisition with single-wavelength array scanning and polychromatic illumination for noise resilience.
  • Implemented interpolation optimization for 3D depth imaging.

Main Results:

  • Simultaneously achieved passive 2D imaging in the visible spectrum and active 3D depth sensing.
  • Demonstrated high imaging fidelity and noise resilience.
  • Verified a 60° field of view and a divergence angle less than 2° in 3D depth imaging.
  • Showcased enhanced broadband depth-resolved synthetic imaging and edge detection.

Conclusions:

  • The Janus metafiber system provides a dual-function imaging solution overcoming limitations of conventional fiber endoscopes.
  • The system exhibits high performance, including imaging fidelity, noise resilience, and accurate depth sensing.
  • This technology holds significant potential for real-time biomedical diagnostics, LiDAR, and industrial inspection.