Structured modulation multi-height microscopy for high-resolution imaging.

Area of Science:

• Optics and Photonics
• Biomedical Imaging
• Microscopy

Background:

• Conventional microscopy faces limitations in resolving fine details due to the diffraction limit.
• Achieving quantitative high-resolution imaging often requires complex setups and struggles to surpass the numerical aperture (NA) limit.

Purpose of the Study:

• To develop a novel structured modulation multi-height microscopy technique for quantitative high-resolution imaging.
• To overcome the diffraction limit for enhanced imaging capabilities.

Main Methods:

• A thin diffuser was placed between the sample and objective lens, with axial translations to capture modulated intensity images.
• A ptychographic phase retrieval algorithm was employed to reconstruct the complex object's wavefront.
• The method was validated using resolution targets, phase targets, and biological samples.

Main Results:

• Demonstrated a resolution gain of approximately 4-fold beyond the diffraction limit.
• Achieved a field of view of 6.5 mm by 4.3 mm with a half-pitch resolution of 1.2 µm.
• Successfully imaged various biological samples with enhanced detail.

Conclusions:

• The structured modulation multi-height microscopy offers a portable solution for quantitative high-resolution imaging.
• This technique has potential applications in disease diagnosis and sample screening.
• The method effectively encodes and retrieves high-resolution object information beyond conventional limits.