Mixed Mode Liquid Crystal Systems
Liquid Crystals can be made to reflect light. In these systems, known as cholesteric or chiral nematic, the liquid crystal has an inherent twist (pitch). When the wavelength of the incident light in the medium matches the pitch of the liquid crystal, the light undergoes reflection. The reflected light has a handedness that matches that of the liquid crystal. As such, these systems can be used as reflective polarizers and are of interest in selective notch filter applications.
AlphaMicron has an active program with the DoD on development of these materials for specific applications.
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