Figure 3 - Fabricated polarization-transparent OADF.
From the following article
Polarization-transparent microphotonic devices in the strong confinement limit
Tymon Barwicz,
Michael R. Watts,
Milo
A. Popovi
,
Peter T. Rakich,
Luciano Socci,
Franz X. Kärtner,
Erich P. Ippen
and
Henry I. Smith
Nature Photonics 1, 57 - 60 (2007)
doi:10.1038/nphoton.2006.41
a, Electron micrograph of the central part of a fabricated polarization-transparent OADF. The PSRs are not shown and extend to the left and the right of the micrograph. The picture was assembled from six successive micrographs and the greyscale was inverted to make the fine lines readable when printed. b, Electron micrograph of the onset of a polarization splitter. The finest features show an aspect ratio of more than 12:1. c–i, Illustration of the novel fabrication technique used to create the bilevel structures. The technique is described in detail in the Methods section.
