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Surface plasmon radiation forces.

Giovanni Volpe1, Romain Quidant, Gonçal Badenes

  • 1ICFO -- Institut de Ciències Fotòniques, 08860 Castelldefels (Barcelona), Spain.

Physical Review Letters
|June 29, 2006
PubMed
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This study demonstrates momentum transfer from surface plasmons to dielectric spheres, a key finding for optical manipulation. Enhanced forces at resonance show potential for optical sorting applications.

Area of Science:

  • Plasmonics
  • Optical forces
  • Nanophotonics

Background:

  • Surface plasmons offer unique light-matter interactions.
  • Optical forces are crucial for manipulating micro- and nanoparticles.
  • Controlling nanoscale forces is essential for advanced applications.

Purpose of the Study:

  • To experimentally observe momentum transfer from surface plasmons to dielectric spheres.
  • To quantify plasmon radiation forces on polystyrene beads near a metal surface.
  • To explore the potential of plasmon-enhanced optical forces for particle manipulation and sorting.

Main Methods:

  • Utilized a photonic force microscope for precise measurements.
  • Measured plasmon radiation forces on polystyrene beads of varying sizes.

Related Experiment Videos

  • Varied the distance between the dielectric sphere and the metal surface.

    • Main Results:

    • First experimental observation of momentum transfer from surface plasmons to a single dielectric sphere.
    • Demonstrated a strong enhancement of plasmon radiation force magnitude at resonance compared to nonresonant illumination.
    • Observed size-dependent optical forces, indicating potential for optical sorting.

    Conclusions:

    • Momentum transfer from surface plasmons to dielectric spheres is experimentally confirmed.
    • Plasmon-enhanced optical forces provide a powerful mechanism for particle manipulation.
    • The findings suggest significant potential for optical sorting applications using plasmonic fields.