Surface Plasmon Polaritons Excited By Electromagnetic Waves Under   General Boundary Conditions
  We investigate single interface surface plasmon polaritons (SPPs) excited by electromagnetic waves under general electromagnetic boundary conditions that allow for non-zero surface charge and surface current densities. Incorporating these, we derive general conditions for single interface SPPs and solve both the surface source distributions and the surface electromagnetic waves for such SPPs when excited by electromagnetic waves. 
Weiguo Yang and Michael A. Fiddy
physics.optics