Dependence of birefringence threshold voltage on dielectric anisotropy in a nematic liquid crystal

摘要

The dielectric anisotropy Dgr;egr; and threshold voltageVthfor electrically controlled birefringence have been measured for a series of nematic liquid crystals (binary mixtures of MBBA and PEBAB) with different negative Dgr;egr; values. The threshold voltage varies as verbar;Dgr;egr;verbar;minus;1sol;2, in agreement with theoretical predictions. The bend elastic constantK33evaluated from these experiments is in orderhyphen;ofhyphen;magnitude agreement with recent measurements for pure MBBA.