Holographic colour prints for enhanced optical security by combined phase and amplitude control.,Nature Communications

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Holographic colour prints for enhanced optical security by combined phase and amplitude control.
Nature Communications ( IF 14.7 ) Pub Date : 2019-01-03 , DOI: 10.1038/s41467-018-07808-4
Kevin T P Lim _{1,

2} , Hailong Liu ₁ , Yejing Liu ₁ , Joel K W Yang _{1,

3}

Affiliation

Conventional optical security devices provide authentication by manipulating a specific property of light to produce a distinctive optical signature. For instance, microscopic colour prints modulate the amplitude, whereas holograms typically modulate the phase of light. However, their relatively simple structure and behaviour is easily imitated. We designed a pixel that overlays a structural colour element onto a phase plate to control both the phase and amplitude of light, and arrayed these pixels into monolithic prints that exhibit complex behaviour. Our fabricated prints appear as colour images under white light, while projecting up to three different holograms under red, green, or blue laser illumination. These holographic colour prints are readily verified but challenging to emulate, and can provide enhanced security in anti-counterfeiting applications. As the prints encode information only in the surface relief of a single polymeric material, nanoscale 3D printing of customised masters may enable their mass-manufacture by nanoimprint lithography.

中文翻译：

全息彩色打印可以通过组合的相位和幅度控制来增强光学安全性。

常规的光学安全设备通过操纵光的特定属性以产生独特的光学签名来提供认证。例如，显微彩色印刷品可调节振幅，而全息图通常可调节光的相位。但是，它们的相对简单的结构和行为很容易被模仿。我们设计了一个像素，该像素将结构色彩元素叠加到相位板上以控制光的相位和振幅，然后将这些像素排列成具有复杂行为的整体打印。我们制作的印刷品在白光下显示为彩色图像，而在红色，绿色或蓝色激光照射下最多投射三个不同的全息图。这些全息彩色印刷品易于验证，但难以模仿，并可以在防伪应用程序中提供增强的安全性。由于印刷品仅在单一聚合材料的表面浮雕中编码信息，因此定制母版的纳米级3D打印可以通过纳米压印光刻技术进行批量生产。

更新日期：2019-01-03

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