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Polarization Spin Inversion with Nonlinear Plasmon Scattering.

Pritam Khan1, Grace Brennan1, Syed A M Tofail1

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Summary
This summary is machine-generated.

We demonstrate that plasmonic microparticles can invert light

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Area of Science:

  • Plasmonics
  • Metamaterials
  • Nonlinear Optics

Background:

  • Circularly polarized light possesses spin angular momentum.
  • Plasmonic nanoparticles support collective electron oscillations (plasmons) that interact with light.
  • Nonlinear optical effects arise from intensity-dependent material responses.

Purpose of the Study:

  • To investigate the inversion of light spin angular momentum using plasmonic microparticles.
  • To explore the role of quadrupole plasmon modes in spin inversion.
  • To examine nonlinear scattering phenomena and their impact on polarization control.

Main Methods:

  • Dark-field scattering microscopy with high-angle collection.
  • Utilizing silvered nanoporous silica microparticles.
  • Employing varying laser power densities (10 W/cm² to 5 GW/cm²).
  • Tuning excitation wavelengths to quadrupole plasmon modes.

Main Results:

  • Observed inversion of circularly polarized light spin angular momentum upon scattering.
  • Demonstrated reverse saturated scattering (RSS) in silvered microparticles at high laser power (5 GW/cm²).
  • Handedness conversion occurred only at wavelengths tuned to quadrupole modes and high power.
  • Linear scattering and unchanged handedness observed at low laser power (10 W/cm²).
  • Addition of ethynylaniline monolayer induced handedness conversion at both low and high powers.

Conclusions:

  • Nonlinear scattering, specifically RSS, enhances quadrupole plasmon modes, leading to light spin inversion.
  • Optical nonlinearity in scattering can be leveraged for polarization tuning in plasmonic metamaterials.
  • Surface modification with monolayers offers a route to control polarization conversion.