A single material alternative to a multilayer optical window

We have proposed a single-material all-dielectric optical filter design to provide efficient transmission of light using aSi. An angularly independent low-pass optical filter was presented designed using a GA which optimized for material thickness, sidewall profile and periodicity. A traditional thin-film multilayer filter was designed, which produced comparable results. Further study could be done to consider filters composed of different materials which may have less loss in the visible spectrum.