| Summary: | 碩士 === 國立交通大學 === 光電工程所 === 89 === We have developed a method to determine the anchoring energy of homeotropically aligned liquid crystal cells. The polar anchoring, pretilt angle, and cell gap of a homeotropically aligned liquid crystal cell could be determined precisely via fitting the experimental optical phase difference and the computer calculated curve. We measured different kinds of liquid crystal cells. In the cells prepared by rubbing, the pretilt angles decreased whit the rubbing strength increasing, but the anchoring energy didn’t change. In the photo aligned cells, the pretilt angles and anchoring energy decreased with the exposing time increasing. We got a photo aligned liquid crystal cell whose uniformity, ion effect, and dynamic response was similar to the rubbing one. We also got the azimuthal anchoring energy in qualitatively by measuring the leaked light of the cells. The anisotropy of alignment layer induced the orientation of liquid crystal molecular could be confirmed by the FTIR measurment.
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