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ON THE BEHAVIOR OF POLARIZED LIGHT IN TWIST-ORIENTED NEMATIC LIQUID CRYSTALS WITH ANISOTROPIC ABSORBENT DYE

Introduction. Light propagation in media with natural or induced anisotropy is currently one of the well-studied sections of optics, with a large number of published monographs [1, 2]. The problem is further complicated by the inhomogeneity of anisotropy. In particular, in a twist-oriented nematic liquid crystal (NLC) the director (optical axis unit vector) is distributed in a spiral pattern. In a number of works [3,4] it has been shown that adding dye to NLC facilitates the management of devices based on them. Therefore, the interest of researchers in such systems is quite explicable. In particular, the properties of the propagation of linearly polarized light in a nematic liquid crystal-pleochroic dye mixture were theoretically studied in [5,6]. In the rotating coordinate system, it was possible to obtain an analytical solution to the problem and to theoretically investigate the peculiarities of the propagation of linearly polarized light in such mixtures. The objective of this paper was the experimental investigation of the behavioral characteristics of polarized light in nematic liquid crystals enriched with an anisotropic absorbent dye. Experimental Setup. Suppose, light propagates in a mixture of an anisotropic absorbent dye and a twist-oriented nematic liquid crystal (Fig. 1). The z axis of the laboratory coordinate system is perpendicular to the glass faces of the sample, the x and y axes are parallel to the main axes of the NLC.