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Invisible Photonic Prints Shown by Deformation

机译：变形显示不可见的光子图像

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摘要

Invisible photonic prints shown by deformation are prepared by soaking the mechanochromic photonic paper with crosslinker (PECDA) and subsequently crosslinking part of the paper through a photo lithography process. The key point of this new technique is creating patterns and background with very close photonic structures but different mechanochromic capabilities, so that the invisible photonic patterns in relaxed state can be revealed under deformation due to the nonuniform change in photonic structure. Based on the relationship between crosslinking level and the reflection changes during deformation, one can conclude that a low crosslinking level favors the hiding of invisible patterns and a high crosslinking level favors the showing of patterns. The as-prepared samples can instantly and reversibly show the patterns by deformation and hide them by relaxation for many times, and the encapsulation by PDMS rubber prolongs its life time and enhances its durability in practical usages. The current printing technique is capable of creating invisible photonic prints in both macroscale and microscale range, which makes them potentially useful for security and antifraud applications in daily life.
机译：通过将光致变色光子纸浸入交联剂（PECDA），然后通过光刻工艺将纸的一部分交联，可以制备出变形显示的不可见光子印刷品。这项新技术的重点是创建具有非常接近的光子结构但具有不同的变色功能的图案和背景，从而可以在由于光子结构的不均匀变化而变形的情况下显示处于松弛状态的不可见光子图案。基于交联度与变形过程中反射变化之间的关系，可以得出结论，低交联度有利于隐藏不可见的图案，而高交联度有利于图案的显示。所制备的样品可以通过变形立即可逆地显示图案，并通过松弛多次隐藏它们，并且PDMS橡胶的包封延长了其寿命并在实际使用中提高了耐久性。当前的打印技术能够在宏观和微观范围内创建不可见的光子打印，这使其在日常生活中的安全性和反欺诈应用中潜在地有用。

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  • 来源
    《Advanced Functional Materials》 |2014年第41期|6430-6438|共9页
  • 作者

    Siyun Ye; Qianqian Fu; Jianping Ge;

  • 作者单位

    Shanghai Key Laboratory of Green Chemistry and Chemical Processes Department of Chemistry East China Normal University Shanghai 200062, P. R. China;

    Shanghai Key Laboratory of Green Chemistry and Chemical Processes Department of Chemistry East China Normal University Shanghai 200062, P. R. China;

    Shanghai Key Laboratory of Green Chemistry and Chemical Processes Department of Chemistry East China Normal University Shanghai 200062, P. R. China;

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