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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
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Optically Driven Gold Nanoparticles Seed Surface Bubble Nucleation in Plasmonic Suspension.

Qiushi Zhang1, Ruiyang Li1, Eungkyu Lee2

  • 1Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States.

Nano Letters
|May 3, 2021
PubMed
Summary

Plasmonic nanoparticle (NP) deposition on transparent surfaces drives photothermal bubble formation. This optically induced NP movement, crucial for microfluidics and biosensing, depends on light direction and intensity.

Keywords:
gold nanoparticlesmicrobubble dynamicsoptical forceplasmonic heating

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Photothermal surface bubbles are vital for microfluidics and biosensing.
  • The origin of bubble formation on transparent substrates in plasmonic nanoparticle (NP) suspensions was previously unknown.

Purpose of the Study:

  • To identify the cause of photothermal surface bubble nucleation.
  • To investigate the role of optically driven plasmonic nanoparticles (NPs) in bubble formation.

Main Methods:

  • Observing optically driven movement of NPs towards a transparent substrate.
  • Analyzing the relationship between laser power density and bubble formation thresholds.
  • Investigating NP motion both with and against the photon stream.

Main Results:

  • Plasmonic NPs deposited on the substrate by optical forces initiate bubble nucleation.
  • Optically driven NP motion occurs both along and against the photon stream.
  • Bubble formation thresholds vary significantly based on the substrate's orientation relative to the light propagation direction, due to differences in optical pulling and pushing dynamics.

Conclusions:

  • Optically driven NP deposition is the primary mechanism for photothermal surface bubble nucleation.
  • Understanding optical forces on NPs is key to controlling photothermal phenomena in microfluidic and biosensing applications.