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Comparative analysis of nonlinear optofluidic processes in microdroplets.

Peng Zhang1, Sunghwan Jung1, Aram Lee2

  • 1Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, Virginia 24061, USA.

Physical Review. E
|July 15, 2016
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Summary

High quality factor whispering gallery modes (WGMs) in liquid microdroplets can cause nonlinear effects. Radiation pressure from WGMs induces the strongest nonlinear optofluidic effect compared to other forces.

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Area of Science:

  • Optofluidics
  • Nonlinear Optics
  • Microfluidics

Background:

  • Previous research demonstrated nonlinear effects in liquid microdroplets using high quality (Q) factor whispering gallery modes (WGMs) via radiation pressure.
  • The nonlinear effects of scattering force and thermocapillarity in such systems remain largely unexplored.

Purpose of the Study:

  • To develop a numerical framework for calculating fluid motion and nonlinearity induced by optical scattering force and thermocapillarity.
  • To compare the nonlinear optofluidic effects of radiation pressure, thermocapillarity, scattering-induced optical force, and the Kerr effect.

Main Methods:

  • Establishment of a numerical framework to model fluid dynamics.
  • Calculation of nonlinear effects induced by various optical and thermal forces.
  • Comparative analysis of different nonlinear optofluidic processes.

Main Results:

  • The numerical framework successfully calculates fluid motion and nonlinearity from optical scattering force and thermocapillarity.
  • Radiation pressure due to WGMs was identified as the dominant nonlinear optofluidic mechanism.
  • The magnitude of nonlinear effects from radiation pressure, thermocapillarity, scattering force, and Kerr effect were quantitatively compared.

Conclusions:

  • The study provides a comprehensive numerical approach to investigate nonlinear optofluidic phenomena in liquid microdroplets.
  • Radiation pressure exerted by WGMs is the most significant contributor to nonlinear optofluidic effects in these systems.