Double stacked structure of cholesteric liquid crystals
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Cholesteric liquid crystals (CLCs) have a self-organized periodic helical structure consisting of nematic liquid crystals (NLCs) and chiral molecules. Owing to their structural peculiarity, CLCs exhibit selective Bragg reflection with photonic bandgap at a certain wavelength band. Many researchers have explored the optical characteristics of CLCs. Especially, dielectric filters using CLCs have been widely studied due to the easy controllability of optical properties responding to diverse factors. In this study, we propose an optical color filter that transmits light with a specific central wavelength in the visible spectrum by stacking two CLC layers having different reflection bands, respectively. Through analytical studies of double-stacked CLC structure, we analyze the optical characteristics of this structure in terms of central transmission wavelength and FWHM.