Surface-enhanced second-harmonic generation of optical beams from a metal surface

Abstract
The spatiotemporal behavior of the surface-enhanced second-harmonic generation at a metal-vacuum interface with a sinusoidal grating is investigated. Using a singular-perturbation approach, the effects of self-phase modulation and the nonlinear excitation of the surface polariton on the enhanced second-harmonic generation are taken into account. The intensity dependence of the enhancement factor is presented. Lateral shift and beam-profile modification are predicted in the second-harmonic radiation.