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Updated: Mar 14, 2026

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Stable, Free-space Optical Trapping and Manipulation of Sub-micron Particles in an Integrated Microfluidic Chip.

Jisu Kim1, Jung H Shin1,2

  • 1KAIST, Department of Physics, 373-1 Guseong-dong, Yuseong-Gu, Daejeon, South Korea.

Scientific Reports
|September 23, 2016
PubMed
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This study showcases stable optical trapping and manipulation of microparticles within a microfluidic chip using integrated waveguides. This novel method offers precise control and enhanced stiffness for sub-micron particle manipulation.

Area of Science:

  • Optics
  • Microfluidics
  • Nanotechnology

Background:

  • Optical trapping commonly uses single beams, limiting manipulation capabilities.
  • Integrated photonic devices offer potential for enhanced optical trapping systems.

Purpose of the Study:

  • To demonstrate stable, free-space optical trapping and manipulation in an integrated microfluidic chip.
  • To utilize counter-propagating beams for precise particle control within a microfluidic environment.

Main Methods:

  • Fabrication of an SU8 inverted ridge-type waveguide with an integrated trench.
  • Integration of the waveguide with a polydimethylsiloxane (PDMS) microfluidic channel.
  • Utilizing counter-propagating beams for optical trapping of polystyrene beads (0.65 μm and 1 μm).

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Related Experiment Videos

Last Updated: Mar 14, 2026

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A Microfluidic-based Hydrodynamic Trap for Single Particles

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Optical Trapping of Nanoparticles
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Optical Trapping of Nanoparticles

Published on: January 15, 2013

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Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment
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Main Results:

  • Stable free-space trapping and manipulation of sub-micron polystyrene beads achieved.
  • Precise manipulation with a resolution of <100 nm demonstrated.
  • Low threshold power (<1 mW) and high trapping stiffness (1 order of magnitude greater than fiber-based methods) confirmed.

Conclusions:

  • The integrated waveguide-microfluidic chip enables efficient and precise optical manipulation.
  • This technology provides a robust platform for advanced microparticle handling in various applications.
  • The system offers significant advantages over existing fiber-based optical trapping techniques.