Article (Scientific journals)
Tilt plane orientation in antiferroelectric liquid crystal cells and the origin of the pretransitional effect
Rudquist, Per; Lagerwall, Jan; Meier, Johann G. et al.
2002In Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics, 66 (6), p. 061708
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Keywords :
antiferreoelectricity; chiral smectic liquid crystals
Abstract :
[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.
Disciplines :
Physics
Author, co-author :
Rudquist, Per
Lagerwall, Jan  ;  Chalmers University of Technology
Meier, Johann G.
D’havé, K.
Lagerwall, Sven T.
Language :
English
Title :
Tilt plane orientation in antiferroelectric liquid crystal cells and the origin of the pretransitional effect
Publication date :
2002
Journal title :
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
ISSN :
1550-2376
Publisher :
American Physical Society, College Park, United States - Maryland
Volume :
66
Issue :
6
Pages :
061708
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBilu :
since 22 March 2015

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