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Spontaneous induction of the uniform lying helix alignment in bimesogenic liquid crystals for the flexoelectro-optic effect
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Schematic of the electro-optic cell, comprising interdigitated in-plane ITO-coated electrodes on lower glass substrates and a planar uniform ITO upper electrode, both substrates coated with planar alignment layers (rubbed parallel to the in-plane electrode long axis).

Image of FIG. 2.
FIG. 2.

Chemical structures of the fluorinated bimesogenic compounds used in mixtures.

Image of FIG. 3.
FIG. 3.

(Color online) Schematic diagram of the uniform lying helix texture induction process using interdigitated electrodes. Application of low frequency, in-plane (V 2, V 3) fields induce defects, which relax into the ULH alignment after the removal of the field. Flexoelectro-optic switching is achieved by applying a voltage across the connected in-plane electrodes (V 2 = V 3) and the top substrate (V 1).

Image of FIG. 4.
FIG. 4.

(Color online) Electro-optic characterization of the device measured at 40 °C: (a) the relative transmitted intensity recorded with application of electric field (2.8 Vrms/μm), 50 Hz signal (black line plotted on primary axis) (i) between the substrate in-plane electrodes only (blue line, plotted on the secondary axis) and (ii) addressing between the lower in-plane electrodes and the upper plane-parallel electrode (red line, plotted on secondary axis), both with crossed polarizers. (b) The tilt angle of the optic axis as a function of the applied electric field. (c) The temperature dependence of the exactly superposable rise and decay response times. (d) The dependence of the transmission on the applied electric field showing full intensity modulation, through crossed polarizers.

Image of FIG. 5.
FIG. 5.

(Color online) Photographs of the electrically induced ULH aligned texture, between crossed polarizers, on a cold-cathode fluorescent backlight. (a) The “off” state with the ULH optic axis positioned along the analyzer direction and (b) the “on” state with the application of an E = 11 Vrms/μm, 50 Hz electric field.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spontaneous induction of the uniform lying helix alignment in bimesogenic liquid crystals for the flexoelectro-optic effect