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30 November 2004 Polarized latent image forming in liquid crystal devices using polymer-surface photomodification technique
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Techniques of polarized latent image formations on liquid crystal (LC) cells have been proposed for optical security devices. The glass plate coated with a photo-reactive polymer film is prepared as a substrate of the LC cell. The polymer surface is rubbed and subsequently modified by exposing with a non-polarized UV light through the photo-mask. The LC cell using the patterned substrate surface is homogeneously transparent under the normal condition (without polarizers). However, the image with continuous grey levels appears when the cell is set between two polarizers. The latent image can also be optically and thermally written on the cell filled with the LC. The guest-host LC cell which has dual latent images is also demonstrated using another photo-reactive polymer. The LC alignment on both substrate surfaces are respectively patterned by the photo modification and rubbing. The latent image can individually be visible and selected by replacing the polarizer in front or behind the LC cell. Our LC patterning process is very simple compared to other patterning methods and the patterning technique which is utilized the mechanical rubbing and photo modification gives great advantages of not only the large area but also the high density patterning.
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Rumiko Yamaguchi, Ryosuke Mizutori, Toru Kawamura, and Susumu Sato "Polarized latent image forming in liquid crystal devices using polymer-surface photomodification technique", Proc. SPIE 5618, Integrated Optical Devices, Nanostructures, and Displays, (30 November 2004);

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