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Updated: Jun 30, 2025

Lensless Fluorescent Microscopy on a Chip
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Super-resolution lensless on-chip microscopy based on array illumination and sub-pixel shift search.

Yulong Li, Jianshe Ma, Liangcai Cao

    Optics Letters
    |March 15, 2024
    PubMed
    Summary

    This study presents a super-resolution lensless on-chip microscopy system using an array light source and sub-pixel shift search. The novel approach achieves high-resolution holographic reconstruction without mechanical components.

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    Area of Science:

    • Optics and Photonics
    • Microscopy
    • Image Processing

    Background:

    • Lensless on-chip microscopy resolution is limited by image sensor pixel size.
    • Existing systems often require mechanical components and precise calibration.

    Purpose of the Study:

    • To introduce a super-resolution on-chip microscopy system overcoming pixel size limitations.
    • To develop algorithms for rapid super-resolution holographic reconstruction.
    • To eliminate the need for displacement control platforms and illumination angle calibration.

    Main Methods:

    • Utilizing a compact array light source with four sequentially illuminating RGB LED modules.
    • Implementing a sub-pixel shift search algorithm based on hologram frequency comparison.
    • Employing a super-resolution reconstruction algorithm with multi-wavelength phase retrieval.

    Main Results:

    • Achieved super-resolution phase reconstruction under partially coherent illumination.
    • Demonstrated a system that obviates the need for a displacement control platform.
    • Enabled rapid super-resolution reconstruction of holograms within a region-of-interest.

    Conclusions:

    • The proposed system and algorithms effectively enhance resolution in lensless on-chip microscopy.
    • The method facilitates practical super-resolution holographic imaging without complex setups.
    • This advancement opens possibilities for compact, high-resolution microscopic imaging applications.