Threshold effects in homeotropically oriented nematic liquid crystals in an external electric field |
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Authors: | V P Romanov G K Sklyarenko |
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Institution: | (1) St. Petersburg State University, 198904 St. Petersburg, Russia |
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Abstract: | The electric field-induced orientational transition in a homeotropically oriented nematic liquid crystal cell is investigated.
The interaction with the field as a result of anisotropy of the permittivity and flexoelectric polarization is taken into
account. For an arbitrary energy of interaction of the nematic with the substrate simple relations are derived for determining
the threshold characteristics of the phase transition. It is shown that, in contrast with planar orientation, in fields above
a critical value a periodic structure can occur only by virtue of the flexoelectric effect. The resulting dependences for
the threshold parameters in the given geometry are exceptionally useful for determining experimentally the surface energy
and the difference in the flexoelectric coefficients.
Zh. éksp. Teor. Fiz. 116, 543–550 (August 1999) |
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