I am working on a science fair project that will concentrate sunlight and then separate it into 3 sections, visible light, infrared light, and everything else (ex. UV). Each will have its own use. I was wondering how to do about the dispersion of the light. I was originally going to use a glass prism but learned that regular glass absorbs infrared. Are there special prisms designed for more than just the visible spectrum? If so, where i could buy one? Also any other ideas on how i could separate the light would be appreciated.