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Visualizing orbital angular momentum of plasmonic vortices.

Z Shen1, Z J Hu, G H Yuan

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Researchers generated plasmonic vortices (PVs) from optical vortex (OV) beams. They experimentally verified the transfer of orbital angular momentum (OAM) from OVs to PVs using particle rotation experiments.

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Area of Science:

  • Optics and Photonics
  • Plasmonics
  • Nanotechnology

Background:

  • Optical vortices (OVs) carry orbital angular momentum (OAM).
  • Focusing OVs onto metal surfaces can generate plasmonic vortices (PVs).
  • Understanding OAM transfer in plasmonic systems is crucial for applications.

Purpose of the Study:

  • To generate and characterize plasmonic vortices (PVs).
  • To experimentally verify the transfer of orbital angular momentum (OAM) from optical vortices (OVs) to PVs.
  • To investigate the relationship between OV topological charge and PV properties.

Main Methods:

  • Generation of PVs by focusing radially polarized OV beams onto a metal surface.
  • Near-field scanning optical microscopy for intensity distribution measurement.
  • Plasmonic trapping experiments using gold micrometer particles to visualize rotation.

Main Results:

  • PV intensity distribution matched theoretical predictions and numerical calculations.
  • Numerical calculations revealed an azimuthal Poynting vector in PVs, indicating OAM transfer.
  • Particle rotation experiments directly visualized OAM transfer, with rotation speed and radius correlating to OV topological charge.

Conclusions:

  • Plasmonic vortices successfully generated and characterized.
  • Orbital angular momentum transfer from optical vortices to plasmonic vortices is experimentally confirmed.
  • PV properties can be tuned by controlling the topological charge of the incident OV beam.