Rabi oscillations in spasers during the nonradiative plasmon excitation
  In the approach to the stationary regime, a spaser exhibits complicated and highly nonlinear dynamics with anharmonic oscillations.1 We demonstrate that these oscillations are due to Rabi oscillations of the quantum dot in the field of the nanoparticle. We show that the oscillations may or may not arise dependent on the initial conditions. 
E. S. Andrianov, A. A. Pukhov, A. V. Dorofeenko, A. P. Vinogradov, and   A. A. Lisyansky
cond-mat.mes-hall