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

• DOI: 10.1103/physrevb.80.233402
• Publication Date: 2009-12-09T00:15:00Z
• Authors: Fu Xiang Wang; Francisco J. Rodr...; Willem M. Albers; Risto Ahorinta; J. E. Sipe; Martti Kauranen
• Keywords: Free electron model; Momentum (technical analysis)

We use two-beam second-harmonic generation to separate the surface (electric dipole origin) and bulk (magnetic electric quadrupole contributions second-order nonlinear optical response of an isotropic gold film. The is unambiguously observed explained by momentum damping electrons in a free-electron model. Although effects could be enhanced inhomogeneous local fields metal nanostructures have been used model from metamaterials [Y. Zeng et al., Phys. Rev. B 79, 235109 (2009)], we find that dominate nonlinearity. Our quantitative results for parameters set baseline future descriptions nanostructured metals.