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Structural colour printing from a reusable generic nanosubstrate masked for the target image

机译:从为目标图像蒙版的可重复使用的通用纳米基材进行结构彩色打印

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摘要

Structural colour printing has advantages over traditional pigment-based colour printing. However, the high fabrication cost has hindered its applications in printing large-area images because each image requires patterning structural pixels in nanoscale resolution. In this work, we present a novel strategy to print structural colour images from a pixelated substrate which is called a nanosubstrate. The nanosubstrate is fabricated only once using nanofabrication tools and can be reused for printing a large quantity of structural colour images. It contains closely packed arrays of nanostructures from which red, green, blue and infrared structural pixels can be imprinted. To print a target colour image, the nanosubstrate is first covered with a mask layer to block all the structural pixels. The mask layer is subsequently patterned according to the target colour image to make apertures of controllable sizes on top of the wanted primary colour pixels. The masked nanosubstrate is then used as a stamp to imprint the colour image onto a separate substrate surface using nanoimprint lithography. Different visual colours are achieved by properly mixing the red, green and blue primary colours into appropriate ratios controlled by the aperture sizes on the patterned mask layer. Such a strategy significantly reduces the cost and complexity of printing a structural colour image from lengthy nanoscale patterning into high throughput micro-patterning and makes it possible to apply structural colour printing in personalized security features and data storage. In this paper, nanocone array grating pixels were used as the structural pixels and the nanosubstrate contains structures to imprint the nanocone arrays. Laser lithography was implemented to pattern the mask layer with submicron resolution. The optical properties of the nanocone array gratings are studied in detail. Multiple printed structural colour images with embedded covert information are demonstrated.
机译:结构彩色印刷优于传统的基于颜料的彩色印刷。然而,高制造成本阻碍了其在打印大面积图像中的应用,因为每个图像都需要以纳米级分辨率对结构像素进行构图。在这项工作中,我们提出了一种新颖的策略,可以从称为纳米基板的像素化基板上打印结构彩色图像。使用纳米制造工具仅可制造一次纳米基板,并且可以将其重新用于打印大量结构彩色图像。它包含紧密堆积的纳米结构阵列,可以从中压印红色,绿色,蓝色和红外结构像素。为了印刷目标彩色图像,首先用掩模层覆盖纳米基板以阻挡所有结构像素。随后根据目标彩色图像对掩模层进行构图,以在所需的原色像素的顶部制作尺寸可控的光圈。然后,将经掩膜的纳米基材用作印模,以使用纳米压印光刻技术将彩色图像压印到单独的基材表面上。通过将红色,绿色和蓝色原色正确混合成适当的比例来获得不同的视觉颜色,该比例由图案化的掩模层上的孔径大小控制。这样的策略显着降低了将结构彩色图像从冗长的纳米级图案印刷到高通量微图案的成本和复杂性,并使将结构彩色印刷应用于个性化安全功能和数据存储成为可能。在本文中,将纳米锥阵列光栅像素用作结构像素,并且纳米基板包含用于压印纳米锥阵列的结构。实施激光光刻以以亚微米分辨率对掩模层进行图案化。详细研究了纳米锥阵列光栅的光学特性。演示了多个带有嵌入式隐蔽信息的印刷结构彩色图像。

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