Enhancement of spontaneous emission in a quantum well by resonant   surface plasmon coupling
  Using time-resolved photoluminescence measurements, the recombination rate in an In$_{0.18}$Ga$_{0.82}$N/GaN quantum well (QW) is shown to be greatly enhanced when spontaneous emission is resonantly coupled to a silver surface plasmon. The rate of enhanced spontaneous emission into the surface plasmon was as much as 92 times faster than normal QW spontaneous emission. A calculation, based on Fermi's golden rule, reveals the enhancement is very sensitive to silver thickness and indicates even greater enhancements are possible for QWs placed closer to the surface metal coating. 
Arup Neogi, Chang-Won Lee, Henry O. Everitt, Takamasa Kuroda, Atsushi   Tackeuchi, and Eli Yablonovitch