A structure including a grating and a semiconductor nanocrystal layer on the grating, can be a laser. The semiconductor nanocrystal layer can include a plurality of semiconductor nanocrystals including a Group II-VI compound, the nanocrystals being distributed in a metal oxide matrix. The grating can have a periodicity from 200 nm to 500 nm.
FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 The U.S. Government may have certain rights in this invention pursuant to Grant No. DMR-98-08941 awarded by the National Science Foundation and Grant No. NSF-CHE-97-08265 awarded by the U.S. Department of Energy.