Surface and bulk contributions to the second-order nonlinear optical response of a gold film

Fu Xiang Wang, Francisco, J. Rodríguez, Willem M. Albers, Risto Ahorinta, J.E. Sipe, Martti Kauranen

Research output: Contribution to journalArticleScientificpeer-review

177 Citations (Scopus)

Abstract

We use two-beam second-harmonic generation to separate the surface (electric dipole origin) and bulk (magnetic dipole and electric quadrupole origin) contributions to the second-order nonlinear optical response of an isotropic gold film. The bulk response is unambiguously observed and explained by momentum damping of electrons in a free-electron model. Although bulk effects could be enhanced by inhomogeneous local fields in metal nanostructures and have been used to model second-harmonic generation from metamaterials [Y. Zeng et al., Phys. Rev. B 79, 235109 (2009)], we find that surface effects dominate the nonlinearity. Our quantitative results for the surface and bulk parameters set the baseline for future descriptions of the second-order response of nanostructured metals.
Original languageEnglish
Article number233402
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume80
Issue number23
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

Keywords

  • gold
  • metallic thin films
  • metamaterials
  • nanostructured materials
  • nonlinear optics
  • optical harmonic generation
  • optical materials

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