Single full-FOV reconstruction Fourier ptychographic microscopy

Area of Science:

• Computational imaging
• Microscopy techniques
• Optical engineering

Background:

• Fourier ptychographic microscopy (FPM) is a computational imaging technique offering high resolution and wide field-of-view (FOV).
• Traditional FPM reconstructs high-resolution images by stitching multiple low-resolution images acquired with variable illumination.
• Limitations of current FPM include reduced intensity with edge illumination and reconstruction inconsistencies due to wavevector variations across the FOV.

Purpose of the Study:

• To address the limitations of conventional Fourier ptychographic microscopy.
• To develop an improved FPM system with enhanced illumination uniformity and stability for wider field-of-view reconstructions.
• To introduce a novel lighting scheme for single-shot, full FOV high-resolution imaging.

Main Methods:

• Proposed a new lighting scheme: full FOV Fourier ptychographic microscopy (F³PM).
• Integrated an LED array with a telecentric lens to provide uniform intensity plane waves at various angles.
• Leveraged telecentric lens properties for improved system stability and simplified illumination angle control.

Main Results:

• F³PM achieved uniform illumination intensity across the entire field-of-view, unlike traditional FPM.
• The telecentric lens ensured consistent wavevectors, enabling single-time reconstruction of the full FOV.
• Single reconstruction FOV reached 14.6 mm² (5.4 mm diameter), a ~10-fold increase compared to traditional FPM, eliminating stitching artifacts.

Conclusions:

• The F³PM system effectively overcomes the illumination challenges of traditional FPM.
• The proposed method significantly expands the field-of-view in single reconstructions while maintaining high resolution.
• F³PM offers a more robust and efficient approach for wide-field, high-resolution computational imaging.