Tao Yichen, Cai Fuxin, Zhan Gangyao, Zhong Hao, Zhou Yun, Shen Su
Opt Express. 2021 May 10;29(10):15217-15227. doi: 10.1364/OE.423923.
Since the printing quick response (QR) code can be easily produced and duplicated as a potential tool for cybercriminals, QR code security has been a hotly debated issue across globe. Here we demonstrate a floating QR code device based on the moiré principle which has the advantage of displaying an appealing three-dimensional (3D) effect and privacy protection. In the imaging system, the microlens array (MLA) contributes to efficiently sampling the multiple elemental images and the metal-coated nanostructure yields patterned structural black color with a high pattern resolution (>12, 500 dpi). A virtual mask scheme is specially developed in the elemental image construction, allowing for eliminating the crosstalk between neighboring units and containing more information in one unit without the necessity for ultra-high-resolution fabrication process and sophisticated operation. The proposed QR code device, capable of being read by an unmodified smart phone, is inexpensive, mass-producible, nondestructive, unclonable and convenient for authentication. This new solution should take a place among the existing solutions to fight counterfeiting and QR code attacks.
由于印刷快速响应（QR）码易于生成和复制，可能成为网络犯罪分子的工具，因此QR码安全一直是全球热议的问题。在此，我们展示了一种基于莫尔原理的浮动QR码装置，该装置具有呈现引人注目的三维（3D）效果和隐私保护的优点。在成像系统中，微透镜阵列（MLA）有助于高效采样多个元素图像，而金属涂层纳米结构产生具有高图案分辨率（>12500 dpi）的图案化结构黑色。在元素图像构建中专门开发了一种虚拟掩膜方案，可消除相邻单元之间的串扰，并在一个单元中包含更多信息，而无需超高分辨率制造工艺和复杂操作。所提出的QR码装置能够被未修改的智能手机读取，价格低廉、可大规模生产、无损、不可克隆且便于认证。这种新解决方案应在现有打击假冒和QR码攻击的解决方案中占有一席之地。
