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The Ag dielectric function in plasmonic metamaterials.

Vladimir P Drachev1, Uday K Chettiar, Alexander V Kildishev

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Summary

Surface roughness does not alter silver dielectric function but increases plasmon resonance loss in coupled strips. Size effects significantly impact the imaginary dielectric function for both light polarizations.

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Area of Science:

  • Plasmonics
  • Metamaterials
  • Optical properties of silver

Background:

  • The dielectric function of silver (Ag) in coupled strips differs from its bulk properties.
  • Arrays of paired silver strips can exhibit metamagnetic properties.
  • Previous studies have investigated coupled strips with varying dimensions and surface roughness.

Purpose of the Study:

  • To investigate the influence of surface roughness on the dielectric function of coupled silver strips.
  • To understand the size effects on the dielectric function for different light polarizations.
  • To analyze the plasmon resonance behavior in these structures.

Main Methods:

  • Theoretical analysis of coupled silver strips.
  • Calculation of dielectric function considering dimensions and surface roughness.
  • Simulation of optical properties for parallel and perpendicular light polarizations.

Main Results:

  • Surface roughness does not affect the silver dielectric function.
  • Surface roughness increases optical loss at plasmon resonances.
  • Significant size effects are observed in the imaginary part of the dielectric function for both polarizations, especially with a large A-parameter.

Conclusions:

  • Surface roughness is not a critical factor for the intrinsic dielectric function of silver in coupled strips.
  • Optical losses are sensitive to surface roughness at plasmon resonances.
  • The dielectric function's size dependence is crucial for understanding the optical behavior of these metamagnetic metamaterials.