Notes:
Ellipsometry measurements and TEM imaging were performed
at the Center for Nanoscale Systems (CNS), a member
of the National Nanotechnology Infrastructure Network
(NNIN), which is supported by the National Science Foundation (NSF) under award No. ECS-0335765. CNS is part of
Harvard University. This work was supported by the Air Force
Office of Scientific Research (AFOSR), award No. FA9550-
09-1-0669-DOD35CAP. IBB acknowledges support from the
Natural Sciences and Engineering Research Council of Canada
(NSERC) through the Postgraduate Scholarship - Doctoral
(PGS-D) program.