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Plasmonic Spectral Splitting in Ring/Rod Metasurface.

Naseer Muhammad1,2,3, Adnan Daud Khan4, Zi-Lan Deng5,6

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Summary

This study demonstrates spectral splitting using Fano resonances in a simple gold metasurface. The design achieves high Q-factor and figure of merit (FoM) for plasmonic sensing and optical switching applications.

Keywords:
Q-factorfano resonancefigure of meritfinite element methodnanostructuressensors

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Area of Science:

  • Plasmonics
  • Metamaterials
  • Nanophotonics

Background:

  • Fano resonances in plasmonic nanostructures enable sharp spectral features.
  • Metasurfaces offer tunable optical properties through structural design.

Purpose of the Study:

  • To investigate spectral splitting behaviors based on Fano resonances.
  • To design and analyze a simple planar metasurface for enhanced optical properties.

Main Methods:

  • Fabrication of a planar metasurface using gold nanobars and nanorings.
  • Exploitation of rotational symmetry to achieve multiple plasmonic modes.
  • Tuning transmission properties by modulating structural parameters.

Main Results:

  • Observation of multiple plasmonic modes and sharp Fano effects in broadband transmittance.
  • Achieved highest single-side Q-factor of 196 and figure of merit (FoM) of 105.
  • Demonstrated effective modification and tuning of transmission properties.

Conclusions:

  • The proposed simple planar metasurface exhibits significant spectral splitting.
  • The design shows potential for multi-wavelength plasmonic sensors, switching, and slow light devices.