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High-resolution and multi-range particle separation by microscopic vibration in an optofluidic chip.

Y Z Shi1, S Xiong, L K Chin

  • 1School of Mechanical Engineering, Xi'an Jiao Tong University, Xian 710049, China.

Lab on a Chip
|June 22, 2017
PubMed
Summary

This study demonstrates an optofluidic chip for high-resolution particle separation. The device achieves precise separation of nanoparticles and bacteria using optically-induced vibrations.

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Area of Science:

  • Optofluidics
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Accurate particle separation is crucial for various biomedical applications.
  • Existing methods often lack the resolution or flexibility for nanoscale and microscale separation.

Purpose of the Study:

  • To demonstrate a novel optofluidic chip for high-resolution and multi-range particle separation.
  • To showcase the device's capability in separating both nanoparticles and biological cells.

Main Methods:

  • Utilizing an optofluidic chip that creates loosely overdamped optical potential wells.
  • Employing optically-induced microscopic vibration for particle manipulation within microchannels.
  • Combining optical and fluidic constraints for precise particle trapping.

Main Results:

  • Achieved the first demonstration of separating single nanoparticles (60-100 nm) with 10 nm resolution.
  • Observed nanoparticle vibrations with amplitudes of 3-7 μm in potential wells.
  • Successfully separated bacteria from larger cells using the same chip and conditions.

Conclusions:

  • The optofluidic chip offers high-resolution particle separation across nanoscale and microscale without reconfiguration.
  • The unique trapping mechanism and versatile performance show significant potential for biomedical applications.
  • This technology enables precise separation of diverse biological entities.