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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Published on: July 5, 2016

Multi-angle lensless digital holography for depth resolved imaging on a chip.

Ting-Wei Su1, Serhan O Isikman, Waheb Bishara

  • 1Electrical Engineering Department, University of California, Los Angeles, CA 90095, USA.

Optics Express
|July 1, 2010
PubMed
Summary

This study introduces a lensfree holographic imaging platform for precise cell positioning in micro-channels. The technology enables accurate 3D cell localization and characterization without bulky optics, advancing lab-on-a-chip diagnostics.

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Area of Science:

  • Optics and Photonics
  • Biomedical Engineering
  • Microfluidics

Background:

  • Accurate characterization of cells in microfluidic devices is crucial for diagnostics.
  • Conventional imaging methods often require complex optics and limited field-of-view.
  • Lab-on-a-chip systems demand compact and high-throughput imaging solutions.

Purpose of the Study:

  • To develop and demonstrate a multi-angle lensfree holographic imaging platform.
  • To achieve accurate axial and lateral positioning of cells within multi-layered micro-channels.
  • To provide a lensless, compact, and high-throughput alternative for cell analysis.

Main Methods:

  • Utilizing lensfree digital holography with multi-angle illumination.
  • Recording holograms at varying illumination angles to induce lateral shifts.
  • Calculating cell height based on the lateral shift of holograms, surpassing the diffraction limit.
  • Demonstrating proof-of-concept with microparticles and applying to blood cell analysis in micro-channels.

Main Results:

  • Achieved sub-micron axial and lateral localization of microparticles over a 60 mm² field of view.
  • Successfully characterized blood cells in multi-layered micro-channels, determining counts, thicknesses, and volumes per layer.
  • Validated the platform's accuracy and throughput capabilities.

Conclusions:

  • The multi-angle lensfree holographic platform offers accurate, high-throughput 3D cell localization and characterization.
  • This lensless approach eliminates the need for bulky optical components, making it ideal for compact lab-on-a-chip systems.
  • The technology presents a promising alternative for advanced cytometry and diagnostic applications.