Wide field-of-view Talbot grid-based microscopy for multicolor fluorescence imaging

Area of Science:

• Optics and Photonics
• Biomedical Imaging
• Microscopy

Background:

• Multicolor, wide field-of-view (FOV) fluorescence microscopy is crucial for screening and pathology.
• Existing methods may face limitations in speed or FOV for certain applications.

Purpose of the Study:

• To develop a novel microscopic slide-imaging system capable of multicolor, wide FOV fluorescence imaging.
• To leverage the Talbot effect for high-speed sample illumination and scanning.

Main Methods:

• A system utilizing the Talbot effect to generate a light-spot grid for sample illumination.
• Excitation beam tilting to scan the Talbot-focused spot across the sample.
• Image reconstruction via collection of fluorescence emissions with relay optics.

Main Results:

• Achieved a wide FOV of 12 × 10 mm(2) with a prototype system.
• Demonstrated rapid acquisition time of 23 seconds for a single fluorescence channel.
• Obtained a resolution with a full-width at half-maximum spot diameter of 1.2 μm.
• Successfully imaged various biological samples including cells and parasites.

Conclusions:

• The developed Talbot effect-based system offers a scalable and simple approach for high-speed, wide FOV fluorescence microscopy.
• This method shows promise for advancing applications in pathology and high-throughput screening.