Ultrafast tuneable optical delay line based on indirect photonic   transitions
  We introduce the concept of an indirect photonic transition and demonstrate its use in a dynamic delay line to alter the group velocity of an optical pulse. Operating on an ultrafast time scale, we show continuously tuneable delays of up to 20 ps, using a slow light photonic crystal waveguide only 300 $\mu$m in length. Our approach is flexible, in that individual pulses in a pulse stream can be controlled independently, which we demonstrate by operating on pulses separated by just 30 ps. The two-step indirect transition is demonstrated here with a 30% conversion efficiency. 
Daryl M. Beggs, Isabella H. Rey, Tobias Kampfrath, Nir Rotenberg, L.   Kuipers, Thomas F. Krauss
physics.optics