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Structured illumination contrast transfer function for high resolution quantitative phase imaging.

Sibi Chakravarthy Shanmugavel, Yunhui Zhu

|December 2, 2023

Summary

This summary is machine-generated.

We developed a new method using structured illumination microscopy (SIM) for super-resolution imaging of non-fluorescent samples. This quantitative phase imaging technique achieves sub-diffraction resolution, enhancing imaging capabilities.

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Phase Contrast and Differential Interference Contrast DIC Microscopy

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Area of Science:

Optical microscopy
Super-resolution imaging
Quantitative phase imaging

Background:

Quantitative phase imaging (QPI) is crucial for label-free microscopy of non-fluorescent samples.
Structured illumination microscopy (SIM) is a super-resolution technique primarily used for fluorescent samples.
Overcoming the diffraction limit in QPI of non-fluorescent specimens remains a challenge.

Purpose of the Study:

To apply structured illumination microscopy (SIM) for sub-diffraction resolution quantitative phase imaging (QPI) of non-fluorescent samples.
To develop a novel contrast transfer function (CTF) formalism for SIM-based QPI.
To demonstrate a deterministic and non-interferometric approach for enhanced phase imaging.

Main Methods:

Utilized a novel application of structured illumination microscopy (SIM) for quantitative phase imaging.
Employed a contrast transfer function (CTF) formalism to extract high spatial frequency phase information from defocused intensity images.
Developed a phase-unwrapping-free algorithm for quantitative phase reconstruction.

Main Results:

Achieved sub-diffraction resolution in quantitative phase imaging of non-fluorescent samples.
Demonstrated a two-fold enhancement in resolution compared to conventional imaging.
Attained a lateral resolution of 0.814 µm for human cheek cells using a 0.42 NA objective and 660 nm illumination.

Conclusions:

The proposed SIM-based QPI technique successfully surpasses the diffraction limit for non-fluorescent samples.
The method offers a practical, non-interferometric setup with a deterministic algorithm.
This approach significantly advances high-resolution quantitative phase imaging capabilities.