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Observation of switching in tri-stable antiferroelectric cells

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Publication details

JournalIEEE Transaction of Ultrasonics Ferroelectrics and Frequency Control
DatePublished - 2004
Number of pages7
Pages (from-to)223-229
Original languageEnglish


An optical convergent beam system has been used to characterise a tri-stable antiferroelectric cell and to observe the complex director reorientation process when a 200 ms dc pulse of +/-50 V is applied. The optical permittivities and director structure are measured for all three states, along with the layer tilt of the tilted-bookshelf structure formed, and from these results the cone angle at 74.9degreesC is calculated to be 35.9 (+/-0.2)degrees. The dynamic behaviour of the cell during the application of the pulse has also been analysed qualitatively. On application of a high voltage the cell switches in less than 7 ms to a ferroelectric state. However, on removal of the voltage, the cell rapidly (<1 ms) switches to the reverse ferroelectric state before relaxing back to the 0V anticlinic alignment over several seconds.

    Research areas

  • antiferroelectric, waveguide, cone angle, switching, LIQUID-CRYSTALS

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