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Nonlinear properties of Surface Plasmon Polaritons stemming from the inherentelectron plasma nonlinearity of the metal layers are investigated. Afluid-mechanics plasma model is used to describe the electron motion in metals.The nonlinear ponderomotive force repels the electrons from the high fieldintensity region, effectively reducing the local plasma frequency and thecorresponding real part of the refractive index results in Kerr likeself-focusing. The field confinement to the low carrier density region alsoassists also in reducing the propagation losses, which usually inhibitpractical nanoplasmonic circuits. Surface plasmon self focusing and nonlinearspectrum modifications, predicted by our model, are demonstrated by preliminaryexperiments.

Surface Plasmon Polariton Self-Focusing by Ponderomotive Forces