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Directional Plasmonic Excitation by Helical Nanotips.

Leeju Singh1, Nicolò Maccaferri2, Denis Garoli3,4

  • 1Electrical and Electronics Engineering Department, Ariel University, Ariel 40700, Israel.

Nanomaterials (Basel, Switzerland)
|June 2, 2021
PubMed
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This summary is machine-generated.

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Researchers used a chiral nanotip to control light-plasmon coupling, achieving directional surface plasmon excitation. This method engineers Fano-like resonances by breaking nanostructure symmetry for spin-dependent effects.

Area of Science:

  • Plasmonics and Nanophotonics
  • Light-Matter Interactions

Background:

  • Coupling light and surface plasmon polaritons (SPPs) necessitates precise momentum matching.
  • Fano-like resonance lineshapes arise from coupling broadband scattering with discrete SPP excitation on metallic surfaces.
  • Phase matching is crucial for engineering light-plasmon coupling and directional SPP excitation.

Purpose of the Study:

  • To investigate the excitation of SPPs using a chiral nanotip.
  • To explore the spin-dependent azimuthal variation in SPP excitation.
  • To demonstrate the modification of light-plasmon coupling via symmetry breaking.

Main Methods:

  • Utilizing a chiral nanotip for surface plasmon excitation.
  • Analyzing the resulting Fano-like interference patterns.
Keywords:
chiraldirectional excitationnanotipplasmonicssymmetry breaking

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  • Investigating the role of symmetry breaking in modifying coupling factors.

    • Main Results:

    • Achieved directional plasmonic excitation with a strong spin-dependent azimuthal variation.
    • Observed Fano-like interference phenomena.
    • Demonstrated that symmetry breaking in the nanostructure allows modification of the complex coupling factor.

    Conclusions:

    • Chiral nanotips can effectively engineer light-plasmon coupling for directional SPP excitation.
    • The observed Fano-like interference is tunable through nanostructure symmetry.
    • This approach offers a pathway for controlling spin-dependent plasmonic phenomena.