Abstract
This paper investigated the effect of a tilting compensator on the anisotropic objects with the radial director configuration in a polarizing optical microscope under orthoscopic observation. The polymer spherulites of poly (ethylene oxide) (PEO) and the radial liquid crystal (LC) droplets in a polymer dispersed liquid crystal (PDLC) film were observed, on behalf of two-dimensional (2D) and three-dimensional (3D) anisotropic entities, respectively. Calculated birefringence patterns found good agreement with the experimental polarizing micrographs. Besides the well-known Maltese cross, the so-called depth-induced light extinction (DILE) bands and corresponding compensation behaviors were investigated in the LC droplets. According to the theoretical and experimental studies, we have revealed plausibly the detailed characteristics of the compensation effects in the 2D and 3D anisotropic objects and the striking differences between them. Some applications of the compensation effect were further pointed out.
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