Induced modulation instability of surface plasmon polaritons.

We demonstrate the effect of the modulation instability of surface plasmon polariton waves in a layer structure of subwavelength thickness. The expressions describing the dispersion and nonlinear properties of this structure are derived. It is shown that the modulation instability effect could be used for the generation of ultrashort pulse trains and the localization of optical fields with a scale less than 1 micron.