Optical security devices using nonuniform schlieren texture of UV-curable nematic liquid crystal.
Optical security devices using nonuniform schlieren texture of UV-curable nematic liquid crystal.
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DOI：
10.1364/ao.55.001012
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发表时间：
2016-02
期刊：
影响因子：
1.9
通讯作者：
K. Nakayama;J. Ohtsubo
中科院分区：
文献类型：
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作者：
K. Nakayama;J. Ohtsubo
我们提出并定量评估了一种光学安全装置，该装置采用计算机图像处理和归一化互相关设计，提供向列液晶中纹影纹理的非均匀或随机图案作为唯一识别信息。使用与第一作者的大学标志相同的掩膜，由聚合各向同性区和聚合向列区组成的书写图案在不同的细胞中是稳定的。从最大相关系数为0.09来看，纹影纹理在不同的细胞中是独特的。这些结果表明，光固化向列相液晶材料具有应用于防伪防伪装置的潜力。
We proposed and quantitatively evaluated an optical security device that provides nonuniform or random patterns of schlieren texture in nematic liquid crystal as unique identification information with a design by employing computer image processing and normalized cross correlation. Using the same photomask as the first author's university logo, the written patterns, which were composed of polymerized isotropic areas and polymerized nematic areas, were stable among different cells. Judging from the maximum correlation coefficient of 0.09, the patterns of the schlieren texture were unique in different cells. These results indicate that photocurable nematic liquid crystal materials have the potential to be applied to security devices for anticounterfeiting measures.