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Updated: May 3, 2026

Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution

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Published on: August 16, 2012

Lensless quantitative microscopy based on multi-angle illumination and coded ptychographic phase retrieval.

Liming Yang, Yuge Xue, Pengming Song

|May 1, 2026

Summary

This summary is machine-generated.

This study introduces a new lensless microscopy technique using coded ptychography and multi-angle illumination. It overcomes limitations in conventional methods to achieve high-resolution, large field-of-view imaging for diverse applications.

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Area of Science:

Optics and Photonics
Microscopy
Image Reconstruction

Background:

Conventional coded ptychography (CP) offers high-resolution, large field-of-view (FOV) imaging but struggles with low-frequency phase recovery.
This limitation hinders reconstruction fidelity by failing to convert slow-varying phase information into detectable intensity variations.

Purpose of the Study:

To develop a novel lensless microscopy method integrating multi-angle illumination with coded ptychographic phase retrieval.
To enhance quantitative phase recovery, particularly for low-frequency components, and improve reconstruction fidelity.

Main Methods:

A new platform utilizes multi-angle illumination and lateral translation of a tube lens for phase diversity measurements.
A coded image sensor captures diffraction patterns, with spatial modulation providing support constraints for phase recovery.
Incident beam angles are directly recovered, and a calibration experiment characterizes the coded layer's transmission profile to address positioning accuracy and phase unwrapping.

Main Results:

The proposed approach achieves a 5.6 mm x 7.4 mm FOV with a 0.96 μm half-pitch resolution.
Successfully overcomes limitations in recovering low-frequency phase components and handles multiple 2π phase wraps.
Demonstrates quantitative phase recovery with improved fidelity.

Conclusions:

The developed lensless microscopy method offers a significant advancement over conventional coded ptychography.
Provides large FOV, high-resolution, and quantitative on-chip imaging capabilities.
Suitable for point-of-care diagnostics, global health, and telemedicine applications.