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A Microflow Cytometer with a Rectangular Quasi-Flat-Top Laser Spot.

Jingjing Zhao1,2,3, Zheng You4,5,6

  • 1State Key Laboratory of Precision Measurement Technology and Instrument, Tsinghua University, Beijing 100084, China. jing.jing.youxiang@163.com.

Sensors (Basel, Switzerland)
|September 15, 2016
PubMed
Summary
This summary is machine-generated.

This study presents a novel microflow cytometer using a microfluidic chip for precise sample focusing and a binary optical element for optimized laser beam shaping. The device demonstrates high-performance microbead counting, rivaling commercial instruments.

Keywords:
binary optical elementmicroflow cytometermicrofluidicsthree dimensional hydrodynamic focusing

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Area of Science:

  • Biomedical Engineering
  • Microfluidics
  • Optical Physics

Background:

  • Flow cytometry is crucial for cell analysis.
  • Conventional flow cytometers face limitations in miniaturization and optical detection.
  • Advanced microfluidic systems are needed for improved performance and portability.

Purpose of the Study:

  • To develop a compact microflow cytometer.
  • To integrate a microfluidic chip with a binary optical element (BOE).
  • To achieve precise three-dimensional (3D) hydrodynamic focusing and optimized laser beam shaping.

Main Methods:

  • Fabrication of a microfluidic chip for 3D hydrodynamic focusing.
  • Utilizing sheath flows and secondary flows for sample stream confinement.
  • Designing and implementing a BOE for a rectangular quasi-flat-top laser spot.
  • Testing the microflow cytometer with fluorescence microbeads of varying sizes.

Main Results:

  • Achieved sample flow focusing to 15 μm height and 8-30 μm width at 5 m/s.
  • Generated a 50 μm × 10 μm rectangular quasi-flat-top laser spot using the BOE.
  • Demonstrated accurate counting of 3, 5, and 7 μm fluorescence microbeads.
  • Experimental results showed performance comparable to or exceeding commercial instruments.

Conclusions:

  • The developed microflow cytometer offers a miniaturized and high-performance solution for particle analysis.
  • The integration of advanced microfluidics and optical elements enhances focusing and detection capabilities.
  • This technology has potential for improved point-of-care diagnostics and research applications.