Method for examining the structural information of heliconical structures of chiral nematics via analyses of the observations of colors and gray levels

Given the maturity of optical applications realized by heliconical structures of chiral nematics in the last few years, we propose a method to reveal the relation between various heliconical structures and the corresponding image colors. Unlike the results deduced by the free energy functional of the adopted liquid-crystal materials, the results of the proposed method show that the variations of heliconical structures depend on the modulation process of applied fields. Without using complicated/expensive techniques, such as confocal microscopy and scanning electron microscopy, the proposed method can be easily adopted to analyze the structural information of heliconical structures.