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This study introduces a novel spin-locking metasurface for precisely controlling surface plasmon (SP) beams. This breakthrough enables selective near-field routing, advancing nanophotonic circuitry applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Nanophotonic circuitry demands precise external control of optical signals in subwavelength volumes.
  • Surface plasmon (SP) routing using metasurfaces is crucial for manipulating light at the nanoscale.
  • Plasmonic spin-orbit interaction, including transverse spin, offers new avenues for near-field plasmonic control.

Purpose of the Study:

  • To propose and demonstrate a spin-locking metasurface for selective near-field SP beam routing.
  • To leverage the transverse spin of SP waves for advanced plasmonic manipulations.
  • To achieve precise directional control of plasmonic distributions.

Main Methods:

  • Design of a spin-locking metasurface incorporating transverse spin.
  • Utilizing oblique incidence of circularly polarized light.
  • Employing grating momentum matching for directional control.
  • Experimental verification using time-resolved leakage radiation measurements.

Main Results:

  • Demonstrated selective routing of near-field SP beams via transverse spin.
  • Achieved precise directional control of plasmonic distributions through combined optical and grating parameters.
  • Visualized the shape and dynamics of the excited SP beams.

Conclusions:

  • The proposed spin-locking metasurface effectively controls SP beam directionality.
  • This technique provides a powerful tool for near-field plasmonic manipulation in nanophotonic systems.
  • Experimental validation confirms the capability for precise directional launching and beam visualization.