  In this contribution we introduce a new strategy for the compensation of
plasmonic losses based on a recently proposed nonlinear mechanism: the resonant
interaction between surface plasmon polaritons and spatial solitons propagating
in parallel along a metal/dielectric/Kerr structure. This mechanism naturally
leads to the generation of a quasi-particle excitation, the so-called
soliplasmon resonance. We analyze the role played by the effective nonlinear
coupling inherent to this system and how this can be used to provide a new
mechanism of quasi-resonant nonlinear excitation of surface plasmon polaritons.
We will pay particular attention to the introduction of asymmetric linear gain
in the Kerr medium. The unique combination of nonlinear propagation, nonlinear
coupling and gain give rise to a new scenario for the excitation of long- range
surface plasmon polaritons with distinguishing characteristics. The connection
between plasmonic losses and soliplasmon resonances in the presence of gain
will be discussed.
