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Optica Publishing Group
  • Journal of Display Technology
  • Vol. 3,
  • Issue 3,
  • pp. 259-265
  • (2007)

Determining the Liquid-Crystal Polar Anchoring at High Electric Fields by Heterodyne Interferometer

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Abstract

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

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