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Related Experiment Video

Updated: Jun 5, 2026

Lensless Fluorescent Microscopy on a Chip
11:23

Lensless Fluorescent Microscopy on a Chip

Published on: August 17, 2011

A microfluidic fluorescence measurement system using an astigmatic diffractive microlens array.

Ethan Schonbrun1, Paul E Steinvurzel, Kenneth B Crozier

  • 1School of Engineering and Applied Science, Harvard University, Cambridge, MA 02138, USA. schonbrun@rowland.harvard.edu

Optics Express
|January 26, 2011
PubMed
Summary
This summary is machine-generated.

This study presents a novel opto-fluidic system using astigmatic microlenses for high-speed particle analysis. The system achieves rapid counting and velocity measurements of microparticles in fluidic channels.

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Last Updated: Jun 5, 2026

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11:23

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14:16

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Published on: December 10, 2011

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Area of Science:

  • Optics and Photonics
  • Microfluidics
  • Biotechnology

Background:

  • Microfluidic devices are crucial for high-throughput biological analysis.
  • Current opto-fluidic systems face limitations in resolution and speed.
  • Diffractive optics offer potential for enhanced optical detection in microfluidics.

Purpose of the Study:

  • To develop and demonstrate an advanced opto-fluidic detection system.
  • To integrate astigmatic diffractive microlenses with a microfluidic flow focus device.
  • To achieve high-speed, high-resolution particle analysis and velocity measurements.

Main Methods:

  • Fabrication of an opto-fluidic chip with an array of astigmatic diffractive microlenses.
  • Utilizing linear excitation and fluorescence collection for uniform detection.
  • Employing a fast CMOS camera for signal acquisition.
  • Implementing signal analysis and cross-correlation for particle counting and velocity determination.

Main Results:

  • Demonstrated counting and resolution of 500 nm and 1.1 μm beads at rates up to 8,300 per second.
  • Achieved velocity dispersion measurements of beads up to 560 mm/s.
  • Showcased uniform excitation and high time resolution in the direction of flow.

Conclusions:

  • The developed opto-fluidic system enables high-speed particle analysis with enhanced resolution.
  • Astigmatic diffractive optics integrated into microfluidics significantly improve detection capabilities.
  • This technology holds promise for advancing applications like flow cytometry and fluorescence cross-correlation spectroscopy.