Applications of polymer post processing of silicon on insulator (SoI) devices are demonstrated. Polymer
overlays on SoI nanophotonic circuits are used, on the one hand, to improve optical antenna transception for
an any-one-to-all array and, on the other hand, a similar photodefinable coating is used to passively tune the
dispersive characteristics of waveguides embedded in photonic crystals. Discussion is given to the polymer
formulation. Coating that requires infiltration into voids with dimension 100 nm and less demands optimized
wetting properties from the pre-cured polymer-in-solution. Atomic Force and Scanning Electron micrographs
and Zygo interferometer image illustrate the quality of the post-photo-definition, cured coatings. Transmission
measurements show a 10 dB improvement in the received signal level for a coated versus uncoated antenna
pair radiating and receiving at 1550 nm. Wavelength dependent transmission measurements on waveguides in
photonic crystals demonstrate that tuning can be affected in post processing performed after foundry fabrication.
Careful formulation of the polymer for nano infiltration allows for tuning without increased attenuation.