| Calligraphic Poling of Ferroelectric Material |
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| NASA's Jet Propulsion Laboratory, Pasadena, California | |
| Aug 31 2007 | |
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advertisement: By varying the magnitude and duration of the applied voltage in conjunction with the motion or stationarity of the electrode, one can exert some control over the sizes and shapes of the ferroelectric domains. For example, it was found that smooth lines having widths of the order of a few microns could be formed by applying potentials between 0.8 and 1.8 kV for times of the order of 10 s while the pen was moving, as illustrated in the left part of the figure. For another example, it was found that potentials between 2 and 3 kV applied for times <2 s while the electrode was held stationary yield hexagons (a consequence of the crystalline structure of LiNbO3), as illustrated in the right part of Figure 2.
 Figure 2. These Are Two Examples of patterns made by calligraphic poling. The images at the left show a 2-μm-wide ring formed on a 100-μm-thick LiNbO3disk at a potential of 1.8 kV applied during a writing time of 10 s. The image at the right shows a 3-μm-wide hexagonal domain formed on a 120-μm-thickLiNbO3 crystal by use of a 2.5-kV bias applied to a stationary electrode for 1.5 s. This work was done by Makan Mohageg, Dmitry Strekalov, Anatoliy Savchenkov, Adrey Matsko, Lute Maleki, and Vladimir Iltchenko of Caltech for NASA’s Jet Propulsion Laboratory. In accordance with Public Law 96-517, the contractor has elected to retain title to this invention. Inquiries concerning rights for its commercial use should be addressed to: Refer to NPO-41566, volume and number of this NASA Tech Briefs issue, and the page number. |
