Reference : Tilt plane orientation in antiferroelectric liquid crystal cells and the origin of th...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Tilt plane orientation in antiferroelectric liquid crystal cells and the origin of the pretransitional effect
Rudquist, Per [> >]
Lagerwall, Jan mailto [Chalmers University of Technology]
Meier, Johann G. [> >]
D’havé, K. [> >]
Lagerwall, Sven T. [> >]
Physical Review. E ,Statistical, Nonlinear, and Soft Matter Physics
American Physical Society
Yes (verified by ORBilu)
College Park
[en] antiferreoelectricity ; chiral smectic liquid crystals
[en] The optic, electro-optic, and dielectric properties of antiferroelectric liquid crystals 􏰐AFLCs􏰋 are analyzed and discussed in terms of the local tilt plane orientation. We show that the so-called pretransitional effect is a combination of two different electro-optic modes: the field-induced antiphase distortion of the antiferroelectric structure and the field-induced reorientation of the tilt plane. In the presence of a helix, the latter corresponds to a field-induced distortion of the helix. Both electro-optic modes are active only when the electric field has a component along the tilt plane. Thus, by assuring a horizontal surface-stabilized condition, where the helix is unwound by surface action and the tilt plane is everywhere parallel to the cell plates, the pretransitional effect should be suppressed. We also discuss the dielectrically active modes in AFLCs and under which circum- stances they contribute to the measured dielectric permittivity.

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