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Acoustoplasmonic Metasurfaces Based on Polymer-Grafted Nanoparticles.

Thomas Vasileiadis1,2, Anuj K Dhiman1,2, Adnane Noual3

  • 1Faculty of Physics and Astronomy, Adam Mickiewicz University, Uniwersytetu Poznanskiego 2, Poznan 61-614, Poland.

Nano Letters
|August 4, 2025
PubMed
Summary
This summary is machine-generated.

Polymer-grafted plasmonic nanoparticles form acoustoplasmonic metasurfaces. These structures exhibit unique acoustic properties and enable precise measurements of nanoscale elasticity using micro-Brillouin Light Scattering.

Keywords:
AcoustoplasmonicsBrillouin light scatteringmetasurfacesoptomechanicspolymer-grafted nanoparticlesself-assembly

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Acoustics

Background:

  • Polymer-grafted plasmonic nanoparticles (PGNs) offer a unique combination of light-matter interactions and soft-matter properties.
  • Metasurfaces composed of PGNs present opportunities for advanced acoustic and optical applications.

Purpose of the Study:

  • To investigate the potential of gold nanoparticles grafted with polystyrene chains as building blocks for acoustoplasmonic metasurfaces.
  • To explore the acoustic properties and surface acoustic waves of PGN monolayers on inorganic substrates.

Main Methods:

  • Fabrication of PGN monolayers on crystalline silicon and SiO2 glass substrates.
  • Micro-Brillouin Light Scattering (μ-BLS) measurements at various photon energies.
  • Finite-element-method (FEM) calculations for acoustic phonons, plasmons, and optomechanics.

Main Results:

  • PGNs sustain coupled sphere modes with distinct rattling, torsional, and quadrupolar features.
  • Plasmon-enhanced BLS was observed, and a wide acoustic band gap was formed below the line of sound.
  • Emergence of shear-horizontal and Sezawa waves, enabling determination of ultrathin PGN monolayer elasticity.

Conclusions:

  • PGNs are effective building blocks for acoustoplasmonic metasurfaces with tunable acoustic properties.
  • μ-BLS coupled with FEM calculations provides a powerful method for characterizing nanoscale acoustic phenomena.
  • The study demonstrates a pathway for measuring the local scale elasticity of ultrathin PGN films.