Magnetic control of flexoelectric domains in a nematic fluid

Magnetic control of flexoelectric domains in a nematic fluid.

The formation of flexoelectric stripe patterns (flexodomains) was studied under the influence of external electric and magnetic fields in a nematic liquid crystal. The critical voltage and wavevector of flexodomains were investigated in different geometries by both experiments and simulations. It is demonstrated that upon altering the orientation of the magnetic field with respect to the direct...

Threshold Flexoelectric Effect in Nematic Liquid Crystal

Mechanisms of flexoelectric switching in a zenithally bistable nematic device

Flexoelectric effects in nematic liquid crystals are well known to occur through combinations of either the sum or the difference of the splay and bend polarizations. In this work we examine the role of both mechanisms in the switching of zenithally bistable nematic devices, and conclude that both can cause bistable switching. Interestingly, we find that the most important flexoelectric coeffic...

Flexoelectric polarisation effects in nematic liquid crystal phase gratings

Nematic phase gratings have been studied in which a planar nematic layer of thickness 17.2 μm is sandwiched between two glass substrates coated with an alignment polymer. The upper substrate is a continuous earth plane and the lower substrate has a patterned electrode of interdigitated stripes (electrodes and gaps are both 40 μm wide). Reorientation of the nematic liquid crystal occurs in respo...

Flexoelectric polarization studies in bent-core nematic liquid crystals.

The flexoelectric polarization (Pf) of four bent-core nematic liquid crystals (LCs) has been measured using the pyroelectric effect. Hybrid aligned nematic cells are fabricated for measuring the pyroelectric response over the entire range of the nematic phase. It is found that the magnitude of flexoelectric polarization Pf and the sum of the flexoelectric coefficients |e1+e3| for the bent-core ...