High-performance lensless diffraction imaging from diverse holograms by three-dimensional scanning.

Area of Science:

• Optics and Photonics
• Imaging Science
• Materials Science

Background:

• Lensless diffraction imaging faces challenges in simultaneously achieving large field of view (FOV) and high resolution with limited data.
• Ptychography offers high resolution but is limited by probe size, requiring extensive data and computation for large samples.
• Multi-height measurement provides a wide FOV but is susceptible to background noise.

Purpose of the Study:

• To develop a lensless diffraction imaging method that overcomes the limitations of existing techniques.
• To achieve high resolution, large FOV, and effective background noise removal concurrently.
• To enhance data diversity and imaging efficiency for lensless diffraction imaging.

Main Methods:

• Proposed a novel lensless diffraction imaging method utilizing three-dimensional (3D) scanning.
• Objects are scanned across three dimensions, not just a plane or optic axis, to gather diverse diffraction information.
• Employed illumination without a confined aperture, expanding the imaging FOV to the sensor size and enabling background noise separation.

Main Results:

• The 3D scanning method successfully separated illumination background noise from the retrieved object.
• Achieved simultaneous high resolution, high contrast, and a large FOV in the reconstructed images.
• Demonstrated superior performance compared to multi-height measurement methods.

Conclusions:

• The proposed 3D scanning lensless diffraction imaging method effectively addresses the trade-offs between FOV, resolution, and data requirements.
• This technique offers a robust solution for imaging large samples with high fidelity and reduced noise.
• Experimental validation confirms the method's capability for simultaneous high resolution, large FOV, and background noise removal.