Optical Rotation-Based Tunable Color Filter Using Chiral Photonic Crystal

摘要

Recently, tunable color filters have been desirable for various applicationssuch as tunable colored glasses, camouflage materials, smart labels, smartwindows, and dynamic displays. An optical rotation-based color tuning(ORCT) method is presented here, which is a cost-effective and nondestructiveway to provide a wide range of color tunability using a controlledcholesteric liquid crystal (CLC) as a chiral photonic crystal and two polarizers.Moreover, the color range of the ORCT can be manipulated by engineeredoptical rotation of the CLC film, which is verified by numerical calculationsand experiments. As a proof of concept, tunable color filters are demonstratedto attenuate unexpected light sources and provide better visibility.We believe that our ORCT technology can be a cornerstone in potential colorvariation applications.