Exploration of holographic window film as an angle selective solar control film

The problem of conserving energy by appropriate window design created a strong need for the development of solar control films. This need, as yet, has not been satisfied by existing technologies. The objective of this project is to develop a new technology of IR rejection films which is derived from the rapidly emerging field of optical holography. The concept of windows utilizes Lippmann-Bragg reflection holograms to obtain wide-band filters reflecting IR radiation with very high efficiency. This new technique will provide marked improvement over the performance of existing solar control films. Not only will it allow full transmission of visible light, but it will also have the capability of reflecting nearly all of solar radiation falling in the near IR region. Additionally, because of the optical degress of freedom which holograms provide, the opportunity for angular selective films and even regionally specific holowindows appears possible.