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Oxide ferroelectric thin film nematic liquid crystal devices.
Whatmore, R. W.; Shaw, C. P.; Zhang, Q.; Roy, S. S.; Gleeson, H. F
Integrated Ferroelectrics. 2001;41:3-16.
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Abstract
The visualization of domains in ferroelecs. by decoration of the surface with nematic liq. crystals (NLC) has been used previously for the study of single crystal ferroelecs. Until recently there has, however, been no work reported on the coupling between NLC and the polarization in ferroelec. thin films. Such a coupling would open the possibility of imparting switchable memory to nematic LC displays. This paper reviews work on the fabrication and testing of device structures with the structure: glass/ITO/PZT/LC/ITO/glass (PZT=240nm sol-gel PbZr0.3Ti0.7O3; ITO= sputtered transparent, conductive indium tin oxide). When a voltage pulse is applied to the sandwich via the ITO electrodes, the switched polarization in the ferroelec. thin film is obsd. It has been found that a thin layer of TiO2, deposited by sol-gel onto the ITO, can be highly beneficial in improving the control of PZT nucleation and grain size/structure, improving the uniformity and quality of the structures. It has also been found possible to measure the poling voltage required to obtain a reorientation in the nematic LC layer and to refer this back to the hysteresis loop obtained from the PZT. The potential of the structure for device applications is discussed. [on SciFinder (R)]
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