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Abstract
Infrared transmission and ATR measurements have been performed on dielectric positive N-(p-ethoxybenzylidene)-p'-cyanoaniline (EBCA) under the combined influences of the weak anchoring and an external DC electric field. The threshold voltage for observing the dielectric molecular orientation was found to be 4 V for a bulk liquid 15 μm thick between Si electrodes. For the molecules in the boundary layer about 0.6 μm thick at the Si electrode, the apparent threshold was 6 V. Differences in the variations of order parameter with voltage were also found between the bulk and boundary layers.