  We investigate the effect of a surface plasmon resonance on Goos-Hanchen and
Imbert-Fedorov spatial and angular shifts in the reflection of a light beam by
considering a three-layer system made of glass, gold and air. We calculate
these spatial and angular shifts as a function of the incidence angle showing
that they are strongly enhanced in correspondence of the resonant angle. In
particular, we find giant spatial and angular Goos-Hanchen shits for the p-wave
light close to the plasmon resonance. We also predict a similar, but less
pronounced, resonant effect on spatial and angular Imbert-Fedorov shifts for
both s-wave and p-wave light.
