I'm having trouble finding polymers that meet the following specs:
1) refractive index between 1.5 and 1.7 (ideally 1.6) 2) photosensitive 3) very low absorption at ~775nm and ~1550nmI want to have a 2-5um-thick layer after spinning.
So far, the only promising candidate is 4000 series Cyclotene (a.k.a. BCB, by Dow), but it's only available in large quantities. Sigma-Aldrich has a wide variety of high-index "waveguide materials," but there isn't any absorption data.
Nathaniel
4000 series Cyclotene info: