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Role of diffusive surface scattering in nonlocal plasmonics.

M K Svendsen1, C Wolff2, A-P Jauho1,3

  • 1Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 29, 2020
PubMed
Summary

The generalized nonlocal optical response (GNOR) theory for plasmonics is analyzed. This study links GNOR

Keywords:
electron diffusiongeneralised nonlocal optical response theorynonlocal plasmonicssurface-enhanced Landau damping

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Area of Science:

  • Plasmonics
  • Condensed Matter Physics
  • Nanophotonics

Background:

  • The generalized nonlocal optical response (GNOR) theory explains plasmon damping and frequency shifts.
  • GNOR uses a phenomenological electron diffusion term but lacks microscopic justification.
  • A key input parameter is the complex hydrodynamic convection-diffusion constant.

Purpose of the Study:

  • To provide a microscopic derivation for GNOR theory.
  • To link the phenomenological GNOR parameter to microscopic surface properties.
  • To elucidate the validity and limitations of GNOR in nonclassical plasmonics.

Main Methods:

  • Analysis of the complex hydrodynamic convection-diffusion constant.
  • Quantification in terms of enhanced Landau damping due to diffusive surface electron scattering.
  • Establishing a link between the diffusion-like term and the Feibelman d-parameter.

Main Results:

  • The diffusion-like term in hydrodynamics efficiently describes Landau damping without complex calculations.
  • A direct connection is established between the diffusion term and the Feibelman d-parameter.
  • A method is provided to connect the GNOR parameter to a frequency-dependent microscopic surface-response function.

Conclusions:

  • The study addresses a principal limitation of GNOR by providing its microscopic justification.
  • The findings facilitate the proper application of GNOR in nonclassical plasmonics.
  • The approach offers a computationally efficient way to model Landau damping.