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Potential Due to a Polarized Object01:29

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Circular Polarization Conversion in Single Plasmonic Spherical Particles.

Pritam Khan1, Grace Brennan1, Zhe Li1,2

  • 1Department of Physics and Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland.

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Summary
This summary is machine-generated.

Gold nanoparticles convert light handedness at visible wavelengths. Molecule adsorption on silvered microparticles shifts this conversion, enabling new sensing and light control applications.

Keywords:
Plasmonadsorptiondampingdark-field microscopymoleculenanoporousparticlesphoton spin angular momentumpolarizationpolarization conversionsensingspin−orbit interaction

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Area of Science:

  • Plasmonics
  • Metamaterials
  • Nanophotonics

Background:

  • Plasmons' temporal and spectral properties are key for metamaterial applications like sensing and polarization control.
  • Understanding light-matter interactions at the nanoscale is crucial for advanced optical devices.

Purpose of the Study:

  • To investigate circular polarization (CP) conversion in plasmonic nanoparticles.
  • To explore the effect of molecule adsorption on CP conversion in silvered microparticles.
  • To correlate CP conversion with plasmonic behavior and material properties.

Main Methods:

  • Dark-field (DF) polarimetry experiments on single gold and silvered nanoporous silica microparticles.
  • Incident circularly polarized light at visible wavelengths.
  • Finite element analysis (FEA) for theoretical modeling.

Main Results:

  • Gold nanoparticles exhibited opposite handedness scattering at visible wavelengths.
  • Silvered microparticles showed handedness conversion at longer visible wavelengths post-molecule adsorption.
  • FEA confirmed CP conversion linked to quadrupolar contributions influenced by size and susceptibility.

Conclusions:

  • Molecule adsorption on nanostructured silver enhances damping, facilitating CP conversion.
  • This work provides insights into molecule sensing and tunable materials for light polarization and spin angular momentum control.