Surface anchoring energy modulation in liquid crystal cells with mixed conductor boundary layers

Strangi, Giuseppe; Versace, Carlo; Scaramuzza, Nicola
April 2001
Applied Physics Letters;4/23/2001, Vol. 78 Issue 17, p2455
Academic Journal
This work concerns the experimental analysis of the influence of the surface charge on the anchoring energy of a nematic liquid crystal (NLC). The study has been carried out on sandwich like cells in which the semitransparent indium tin oxide electrodes were covered by a sputtered tungsten trioxide film to supply an extra amount of surface charge. We found that the huge amount of tungsten-oxide protons injected at the oxide-NLC interface play a key role in weakening the surface anchoring energy. To estimate the surface anchoring energy during a bias-controlled injection process, a photopolarimetric technique has been used. The result highlights the importance of the polarized surface on the anchoring breaking mechanism. © 2001 American Institute of Physics.


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