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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
Summary
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.
- 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.
