Conference Paper

Second harmonic generation at conductor surfaces with continuous profiles

Inst. de Fisica, Univ. Nacional Autonoma de Mexico, Mexico City
DOI: 10.1109/NLO.1994.470794 Conference: Nonlinear Optics: Materials, Fundamentals, and Applications, 1994. NLO '94 IEEE
Source: IEEE Xplore


Summary form only given. We have extended the hydrodynamic model
to calculate the linear and non-linear response and the nonlinear
efficiency of semiinfinite metals taking account the electronic density
profile at their surface. The surface nonlinear susceptibility and its
efficiency display a series of very large peaks, several orders of
magnitude larger than those obtained for abrupt profiles, corresponding
to the excitation of multipolar surface modes at w and 2w. Our results
suggest that the multipolar modes, which are difficult to observe in
electron scattering experiments, might be observed through SHG
spectroscopy. We hope this calculation encourages more experiments to
measure the frequency dependence of the SHG signal