Single-shot 3D imaging with point cloud projection based on metadevice

Area of Science:

• Optics and Photonics
• Computer Vision
• Materials Science

Background:

• Three-dimensional (3D) imaging is vital for applications like autonomous vehicles and machine vision.
• Metasurfaces offer flexible optical wavefront control due to their subwavelength structure and design freedom.
• Existing 3D imaging techniques often require complex setups or multiple measurements.

Purpose of the Study:

• To propose a flat optical device utilizing a single-layer metasurface for single-shot 3D reconstruction.
• To develop a sophisticated matching algorithm for accurate 3D data processing.
• To demonstrate a practical and feasible submillimetre measurement platform.

Main Methods:

• Design and fabrication of a single-layer metasurface optical device.
• Projection of a coded point cloud in Fourier space using the metasurface.
• Implementation of a matching algorithm for 3D reconstruction from the projected data.
• Experimental validation of depth accuracy at a specific measurement distance.

Main Results:

• The proposed metasurface device successfully projects a coded point cloud.
• The developed matching algorithm enables accurate 3D reconstruction.
• Experimental results show a depth accuracy better than 0.24 mm at 300 mm distance.
• The system demonstrates the feasibility of a submillimetre measurement platform.

Conclusions:

• A single-layer metasurface-based flat optical device enables efficient single-shot 3D imaging.
• The developed system achieves high depth accuracy, suitable for submillimetre measurements.
• This technology has potential applications in surface shape detection, gesture recognition, and personal authentication.