Abstract
The response time and contrast of vertically-aligned negative nematics depend
critically on the aligning surface and its induced pretilt. Pretilt can be tuned up
using obliquely evaporated inorganic oxides as alignment surface.A thorough study of
pretilt angles induced by aligning surfaces of thermally evaporated ${\hbox{SiO}}_{x}$
has been carried out on several commercial and experimental negative nematic mixtures.
Morphology of ${\hbox{SiO}}_{x}$ with different evaporation angles has been studied by
Field Emission Scanning Electron Microscopy. Some morphological variations appear at
specific evaporation angles. These are related to the pretilt induced by the surface and
to the dynamic response of the device.
© 2010 IEEE
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