Single-photon excitation of surface plasmon polaritons
  We provide the quantum mechanical description of the excitation of surface plasmon polaritons on metal surfaces by single-photons. An attenuated-reflection setup is described for the quantum excitation process in which we find remarkably efficient photon-to-surface plasmon wavepacket-transfer. Using a fully quantized treatment of the fields, we introduce the Hamiltonian for their interaction and study the quantum statistics during transfer with and without losses in the metal. 
M. S. Tame, C. Lee, J. Lee, D. Ballester, M. Paternostro, A. V.   Zayats, M. S. Kim