I'm searching for candidate polymers that possess very low refractive index (~1.3 - 1.35) in the visible portion of the spectrum. Polymers that could be injection molded are preferred, but even relatively thin, solvent coatings may be acceptable. Adhesion to other engineering optical plastics...
Your need for a "polished" surface depends greatly on the application of the part - whether imaging or illumination. If yor application involves imaging through the "polished" region, you will neeed to employ optical specification that quantify scratch & dig, power and irregularity, and perhaps...
