Ultrafast reflectivity modulation in AlGaAs/InAlGaAs multiple quantum   well photonic crystal waveguides
  We report an ultrafast optical tuning of the reflectivity of AlGaAs/InAlGaAs multiple quantum well photonic crystal waveguides using a reflection geometry, pump-probe technique. 
A. Z. Garcia-Deniz, P. Murzyn, A. M. Fox, D. O. Kundys, J-P. R. Wells,   D. M. Whittaker, M. S. Skolnick, T. F. Krauss, J. S...
cond-mat.mes-hall physics.optics