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Microfluidic-based linear-optics label-free imager.

Omer Wagner1, Eitan Edri, Pooria Hadikahani

  • 1Faculty of Engineering and the Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel.

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|March 5, 2020
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Summary
This summary is machine-generated.

This study introduces a microfluidic system for label-free nanoscopy, enabling high-resolution imaging of biological samples like E. coli using controlled nanoparticle scanning and light scattering. This method overcomes previous limitations in nanoparticle hydrodynamics for faster, more accurate mapping.

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Microfluidics
  • Biophysics

Background:

  • Linear optics nanoscopy achieved super-diffraction limit resolution but faced challenges with complex nanoparticle hydrodynamics for biological sample scanning.
  • Previous methods struggled with controlled nanoparticle motion, hindering practical application on real biological specimens.
  • A need existed for a reliable method to perform controlled nanoparticle scanning on biological samples for advanced imaging.

Purpose of the Study:

  • To develop and demonstrate a microfluidic system for controlled nanoparticle scanning and label-free optical nanoscopy of biological samples.
  • To overcome the hydrodynamic complexities and improve the speed and accuracy of nanoparticle-based sample mapping.
  • To enable high-resolution imaging of biological structures using evanescent light scattering and reconstruction in the far field.

Main Methods:

  • A microfluidic channel was utilized to confine biological samples within a water droplet alongside metallic nanoparticles suspended in silicone oil.
  • Evanescent light scattered from the sample was rescattered by nanoparticles, encoding sub-wavelength features for far-field reconstruction.
  • Amphiphilic nanoparticles were employed at the water/oil interface to enhance evanescent field capture for improved resolution and signal-to-noise ratio.

Main Results:

  • The microfluidic system facilitated controlled nanoparticle scanning, maintaining isolated sample environments within droplets.
  • High-resolution contour imaging of an E. coli sample was achieved, demonstrating the method's capability.
  • The system successfully enabled a linear, label-free optical imaging process using microfluidics for the first time.

Conclusions:

  • The developed microfluidic-based nanoscopy system offers a robust solution for controlled nanoparticle scanning and high-resolution imaging of biological samples.
  • This approach overcomes limitations of previous nanoscopy techniques, paving the way for advanced label-free imaging in biophysics.
  • The study represents a significant advancement in applying microfluidic devices for optical nanoscopy of biological specimens.