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This study reveals how optical vortices enable 3D trapping of nanoparticles using gold dimer arrays. It explains nanoparticle (NP) movement, including spinning and spiral trajectories, in near-field plasmonic nanostructures.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Optical Trapping

Background:

  • Plasmonic nanostructures offer unique light-matter interactions.
  • Optical forces can manipulate nanoscale objects.
  • Understanding near-field effects is crucial for nanophotonics.

Purpose of the Study:

  • To theoretically investigate 3D optical vortex trapping of polystyrene nanoparticles (NPs) using a 1D gold dimer array.
  • To elucidate the mechanisms behind contact and non-contact trapping modes.
  • To analyze the role of optical torque and spin-orbit interaction in NP manipulation.

Main Methods:

  • Theoretical modeling of optical force fields.
  • Simulation of nanoparticle behavior under optical illumination.
  • Analysis of optical torque and trajectory dynamics.

Main Results:

  • Identified two trapping modes: contact (attraction to dimer) and non-contact (3D spiral trajectory).
  • Observed transverse spinning of NPs due to optical torque, even with linearly polarized light.
  • Demonstrated transverse spin-orbit interaction linked to opposite helicities of spin and spiral orbit.
  • Observed step-like NP motion synchronized with optical vortex dynamics and array movement.

Conclusions:

  • Optical vortices play a key role in near-field trapping by plasmonic nanostructures.
  • The study provides theoretical insights consistent with experimental observations.
  • This work deepens the understanding of light-driven nanoscale manipulation.