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