Stimulated light emission and inelastic scattering by a classical linear   system of rotating particles
  The rotational dynamics of particles subject to external illumination is found to produce light amplification and inelastic scattering at high rotation velocities. Light emission at frequencies shifted with respect to the incident light by twice the rotation frequency dominates over elastic scattering within a wide range of light and rotation frequencies. Remarkably, net amplification of the incident light is produced in this classical linear system via stimulated emission. Large optically-induced acceleration rates are predicted in vacuum accompanied by moderate heating of the particle, thus supporting the possibility of observing these effects under extreme rotation conditions. 
Ana Asenjo-Garcia, Alejandro Manjavacas, and F. Javier Garc\'ia de   Abajo
quant-ph physics.atm-clus physics.optics