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Siloxane antiferroelectric liquid crystalline dimer exhibiting two field-free zero birefringent states.

Journal article
Authors Nils Olsson
Ingolf Dahl
Bertil Helgee
Lachezar Komitov
Published in Liquid Crystals
Volume 31
Issue 12
Pages 1555-1568
ISSN 0267-8292
Publication year 2004
Published at Department of Physics (GU)
Pages 1555-1568
Language en
Keywords siloxane, antiferroelectric, liquid crystalline, dimer, tilt, polarization
Subject categories Material physics with surface physics, Photonics, Organic synthesis, Inorganic Chemistry, Physical Chemistry, Mesoscopic physics, Optical physics


We studied the optical and electro-optical properties of a siloxane antiferroelectric liquid crystalline dimer exhibiting a large molecular tilt that reached a maximum value of 53°. When the molecular tilt angle in the antiferroelectric phase exceeded 45°, it was found that the field-free position of the slow vibration direction, which corresponds to the largest refractive index, flipped from a position along the smectic layer normal, to a position perpendicular to it. When the tilt angle became 45°, a zero birefringent state, which was theoretically predicted by de Meyere in 1996, was also found to occur twice in the antiferroelectric phase of the siloxane dimer.

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