Optical single-pixel volumetric imaging by three-dimensional light-field illumination

Area of Science:

• Optics and Photonics
• Biomedical Imaging
• Microscopy

Background:

• Three-dimensional single-pixel imaging (3D SPI) is valuable for biomedical research and optical sensing.
• Current 3D SPI methods using time-of-flight or stereovision are limited to millimeter-level depth resolution for surface mapping.
• A need exists for 3D imaging techniques with higher resolution, particularly for microscopic applications.

Purpose of the Study:

• To introduce and demonstrate a novel 3D SPI technique, 3D light-field illumination single-pixel microscopy (3D-LFI-SPM).
• To achieve volumetric imaging of microscopic objects with near-diffraction-limit 3D optical resolution.
• To enable label-free 3D visualization of optical absorption contrast in biological samples.

Main Methods:

• 3D-LFI-SPM optically samples the 3D Fourier spectrum.
• Combines 3D structured light-field illumination with single-element intensity detection.
• A prototype system was constructed for volumetric imaging.

Main Results:

• The 3D-LFI-SPM prototype achieved an imaging volume of approximately 390 × 390 × 3,800 μm³.
• Demonstrated a lateral resolution of 2.7 μm and an axial resolution better than 37 μm.
• Successfully visualized label-free optical absorption contrast in single algal cells in vivo.

Conclusions:

• 3D-LFI-SPM enables high-resolution volumetric imaging of microscopic structures.
• The technique offers significant improvements over existing 3D SPI methods.
• This approach has broad potential for 3D SPI applications, including advanced biomedical functional imaging.