Field control of the surface electroclinic effect in chiral smectic-A liquid crystals

Phys Rev E Stat Nonlin Soft Matter Phys. 2004 Jun;69(6 Pt 1):061716. doi: 10.1103/PhysRevE.69.061716. Epub 2004 Jun 23.

Abstract

The surface electroclinic effect, which causes an azimuthal deviation of the layer normal from the surface rubbing direction in cells of chiral smectic- A liquid crystals, can be eliminated (and even reversed) by applying an electric field during cooling from the isotropic phase. The observed dependence of layer orientation on field strength leads to a model in which the surface electroclinic tilt results from an effective surface electric field. The experiements suggest a general method for controlling the azimuthal layer alignment of chiral smectic cells.