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Nonradiative surface plasmon assisted microscale Marangoni forces.

A Passian1, S Zahrai, A L Lereu

  • 1Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. passianan@ornl.gov

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 16, 2006
PubMed
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Surface energy gradients drive liquid droplet motion when heated unevenly. This study demonstrates optical control of droplet movement via surface plasmon decay, enabling new microfluidic applications.

Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Temperature gradients on liquid droplet surfaces create surface energy gradients.
  • These gradients can induce thermocapillary flow, leading to droplet motion.
  • Optical excitation of surface plasmons can generate localized heating.

Purpose of the Study:

  • To investigate droplet transport induced by surface plasmon decay.
  • To demonstrate Marangoni forces as the driving mechanism for this motion.
  • To explore applications in all-optical modulation and microfluidics.

Main Methods:

  • Experimental observation of pico-liter droplet movement on a gold foil.
  • Theoretical analysis using Marangoni effect principles.
  • Computational fluid dynamics (CFD) visualization of droplet flow.

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Main Results:

  • Surface plasmon decay creates thermal gradients that drive thermocapillary flow.
  • Marangoni forces were confirmed as the primary mechanism for droplet motion.
  • Experimental evidence of surface modification due to plasmon excitation was observed.

Conclusions:

  • Surface plasmon-induced thermocapillary flow offers a novel method for droplet manipulation.
  • This phenomenon has potential applications in all-optical light modulation.
  • The findings are relevant for microfluidics, droplet actuation, and SPR sensing.