| 초록 |
Cholesteric Liquid crystals (CLCs) are one of the liquid crystal phases that display unique optical properties arisen from their helical superstructure. CLCs can be formed by doping chiral material in an achiral LC host inducing a spiral twisting of LC molecules. Due to their periodic modulation of the refractive index, CLCs exhibit a photonic bandgap property. By adjusting periodicity to be comparable with the wavelength of the visible light, CLCs show structural colors through Bragg’s reflection.In particular, CLCs in spherical confinement develop an additional color pattern called photonic cross-communication. The peripheral patterns are generated by the retro-reflection of the light-mediated via neighboring CLC drops. In this study, the cross-communications taking place between non-identical CLC emulsions are investigated. The cross-communication between non-identical contacting CLC drops is successfully observed, demonstrating the mechanism of cross-communication comes from the beam path and overlapping stopbands. Furthermore, various arrays of distinct CLC drops can show non-cloneable optical patterns, making this system promising for application in anticounterfeit. |
