Abstract
ABSTRACT Measurements of optical birefringence have been performed on mesogen 4-cyano-4′-n-octyloxybiphenyl (8OCB) from a voltage-dependent optical transmission technique. The temperature dependence of birefringence has been determined from the voltage dependence of transmitted intensity through homogeneously aligned (planar) plane-parallel liquid crystal-filled cells of different cell-thicknesses. At a particular temperature, a systematic increase of birefringence has been observed with a decrease in cell-thickness. From the optical birefringence data, related orientational order parameter values have also been calculated. The outcomes for orientational order parameter are compared with those reported from other well-known techniques for the similar mesogen. Close agreement among the temperature dependence of orientational order parameter from this study and those from other techniques validates the reliability of the present optical method in precise investigation of physical characteristics of liquid crystalline materials.
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