{HEAD ~ A structure} including {TAIL ~ a grating} and a semiconductor nanocrystal layer on the grating, can be a laser 
including
{ HEAD ~ A structure } including { TAIL ~ a grating } and a semiconductor nanocrystal layer on the grating , can be a laser
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH