Optical Gain from InAs Nanocrystal Quantum Dots in a Polymer Matrix
  We report on the first observation of optical gain from InAs nanocrystal quantum dots emitting at 1.55 microns based on a three-beam, time resolved pump-probe technique. The nanocrystals were embedded into a transparent polymer matrix platform suitable for the fabrication of integrated photonic devices. 
Gang Chen, Ronen Rapaport, Dan Fuchs, Sahar Vilan, Assaf Aharoni, Uri   Banin