Amplification of surface plasmon-polariton by pumping of an active layer at the surface

The self-consistent theory of SPP amplification by interaction of SPP with excited layer of surface cover (sub-monolayer of organic dye molecules or quantum dot array) is proposed in the present work. The local field effects are taken into account when quantization of SPP´s field and calculation of susceptibility of the objects consisting the active layer at the surface is performed. It was shown that the pumping of the cover with certain intensity can lead to increasing the life-time of the SPP and the mean free-path.