A common-path heterodyne interferometer is proposed to determine the surface anchoring energy of a homogeneously aligned nematic liquid crystal (LC). This technique measures, with high sensitivity, the phase retardation of a nematic LC cell as a function of the applied voltage. According to the measured voltage-dependent phase retardation of the LC cells, a simple linear fitting over a well-specified voltage window can be achieved, leading to a precise determination of the polar anchoring energy. The anchoring energy W<sub>a</sub>, cell gap, and pretilt angle can be simultaneously obtained in the course of the same experiment.
© 2007 IEEE
Shug-June Hwang, Hsin Her Yu, and Min-Hua Hsu, "Determining the Liquid-Crystal Polar Anchoring at High Electric Fields by Heterodyne Interferometer," J. Display Technol. 3, 259-265 (2007)