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Deterministic particle assembly on nanophotonic chips.

Razie Khalesi Moghaddam1, Nikhil Bhalla2, Amy Q Shen3

  • 1Department of Chemical & Petroleum Engineering, University of Calgary, 2500 University Drive NW, Calgary T2N 1N4, Alberta, Canada.

Journal of Colloid and Interface Science
|July 2, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method for controlled particle assembly using laser-induced microbubbles on localized surface plasmon resonance (LSPR) substrates. This technique enables precise manipulation of particle clusters for lab-on-a-chip and biosensing applications.

Keywords:
Bubble shrinkageHot spot formationNanophotonic chipsSelf-assemblySurface plasmonic resonance

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Area of Science:

  • Nanophotonics
  • Plasmonics
  • Materials Science

Background:

  • Controlled particle assembly is crucial for microfluidics and biosensing.
  • Laser-induced phenomena on plasmonic substrates offer potential for manipulating particles.

Purpose of the Study:

  • To demonstrate controlled particle assembly using laser-induced microbubbles on localized surface plasmon resonance (LSPR) substrates.
  • To investigate the role of LSPR substrates in guiding particle assembly via microbubble collapse.

Main Methods:

  • Silica particle dispersions were deposited on gold nanoisland (LSPR) and planar gold (SPR) substrates.
  • Microbubbles were generated using laser excitation, and parameters like laser power and particle concentration were varied.
  • Sodium chloride (NaCl) was added to stabilize assembled structures.

Main Results:

  • Particle assembly was achieved exclusively on LSPR substrates due to electron energy dissipation through nanoscale air gaps.
  • The size and number of assembled particle clusters were controllable by tuning laser parameters and particle concentration.
  • NaCl addition screened electrostatic charges, promoting stable particle assembly for extended periods.

Conclusions:

  • Laser-induced microbubble collapse on LSPR substrates provides a novel and effective method for controlled particle assembly.
  • This technique offers a new framework for nanophotonic chip applications, enabling light-directed particle manipulation.
  • The findings have implications for advancing lab-on-a-chip devices and sensitive biosensing platforms.