Electromagnetically induced coherent backscattering
  We demonstrate a strong coherent backward wave oscillation using forward propagating fields only. This is achieved by applying laser fields to an ultra-dispersive medium with proper chosen detunings to excite a molecular vibrational coherence that corresponds to a backward propagating wave. The physics then has much in common with propagation of ultra-slow light. Applications to coherent scattering and remote sensing are discussed. 
Yuri V. Rostovtsev, Zoe-Elizabeth Sariyanni, and Marlan O. Scully