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Optimized flexoelectric response in a chiral liquid-crystal phase device
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10.1063/1.2006227
/content/aip/journal/jap/98/3/10.1063/1.2006227
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/3/10.1063/1.2006227

Figures

Image of FIG. 1.
FIG. 1.

Schematic illustration of the deformation of the chiral nematic helical director structure (a) due to flexoelectro-optic (b) and dielectric (c) coupling to an electric field applied orthogonal to the helical axis. The effect of the deformation is viewed along (upper figure) and perpendicular (lower figure) to the helical axis to illustrate the source of the resulting birefringence. Note in the flexoelectric example the differing electric-field direction for the two views, necessary for illustrative purposes.

Image of FIG. 2.
FIG. 2.

The chemical structures and formulas for the bimesogenic liquid crystals used in this study.

Image of FIG. 3.
FIG. 3.

Schematic diagram of the cell geometry of the Grandjean-textured in-plane field cell (not to scale).

Image of FIG. 4.
FIG. 4.

Electric-field-induced birefringence at differing field amplitudes and frequencies for mixture (1) at .

Image of FIG. 5.
FIG. 5.

Electric-field-induced birefringence at differing field amplitudes and frequencies for mixture (2) at .

Image of FIG. 6.
FIG. 6.

Electric-field-induced birefringence at differing field amplitudes and frequencies for mixture (3) at .

Image of FIG. 7.
FIG. 7.

The field-following (flexoelectrically induced) portion of the induced birefringece in the Grandjean-textured cell, as a function of the flexoelectro-optic tilt angle measured in the uniform lying helix (ULH) texture, for the three mixtures at .

Image of FIG. 8.
FIG. 8.

Diagram illustrating the small change in effective refractive index in the direction of light polarization for small flexoelectro-optic tilt angles due to the ellipsoidal shape of the indicatrix.

Tables

Generic image for table
Table I.

The averaged 10%–90% and 90%–10% response times observed in both the Grandjean-textured in-plane field cell and the ULH-textured flexoelectro-optic cells. All times are measured at for a switch from and back in the Grandjean case and from and back in the ULH case.

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/content/aip/journal/jap/98/3/10.1063/1.2006227
2005-08-11
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optimized flexoelectric response in a chiral liquid-crystal phase device
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/3/10.1063/1.2006227
10.1063/1.2006227
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