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Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers
10:21

Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers

Published on: May 5, 2016

Particle separation in fluidic flow by optical fiber.

Hongxiang Lei1, Yao Zhang, Baojun Li

  • 1State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou, China.

Optics Express
|January 26, 2012
PubMed
Summary

Optical fiber sorting separates particles by size using light-induced forces in fluid flow. This method leverages photophoresis and fluid dynamics for efficient particle manipulation and separation.

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Area of Science:

  • Optics
  • Fluid Dynamics
  • Particle Physics

Background:

  • Particle manipulation in fluidic systems is crucial for various applications.
  • Photophoresis, the movement of particles induced by light, offers a non-contact method for particle control.

Purpose of the Study:

  • To demonstrate particle separation based on size using an optical fiber.
  • To investigate the role of optical forces and fluid dynamics in particle sorting.

Main Methods:

  • Utilizing a 1.55 μm light source launched into an optical fiber to trap particles.
  • Introducing fluidic flow to induce separation of trapped particles based on size.
  • Analyzing light intensity distribution and energy asymmetry factor.

Main Results:

  • Successful separation of different-sized particles (Poly(methyl methacrylate) and SiO(2)) in fluidic flow.
  • Demonstrated separation of mixed particles including yeast cells.
  • Identified light intensity distribution and asymmetry factor as critical for separation efficacy.

Conclusions:

  • Optical fiber-based sorting is an effective method for size-dependent particle separation.
  • The interplay of negative photophoretic force and fluid drag enables precise particle manipulation.
  • Numerical simulations and theoretical interpretations support the observed separation mechanism.