Goncharsky Anton, Durlevich Svyatoslav
Research Computer Center, M.V. Lomonosov Moscow State University, Leninskiye Gory, 1, Building 4, Moscow, 119991, Russia.
Sci Rep. 2020 Jun 30;10(1):10606. doi: 10.1038/s41598-020-67590-6.
An optical security element forming different 2D images when it is turned by 180 degrees is developed and manufactured for the first time. A synthesis technology is developed that incorporates the computation of the beam pattern in elementary hogels with sizes smaller than 100 microns, computation of the phase function of the diffractive optical element (DOE), and formation of the microrelief of the DOE using electron-beam technology. The DOE employed is a multilevel kinoform with an asymmetrical microrelief shaped with a precision of 10 nm. The resulting security feature is easy to control visually, and the DOE is securely protected against counterfeiting. These DOEs are easy to replicate using standard technologies in the manufacturing of embossed holograms and can be used to protect bank notes, securities, and documents against counterfeiting.
首次研发并制造出一种光学安全元件，当它旋转180度时会形成不同的二维图像。开发了一种合成技术，该技术包括计算尺寸小于100微米的基本全息体素中的光束图案、计算衍射光学元件（DOE）的相位函数以及使用电子束技术形成DOE的微浮雕。所采用的DOE是一种多级相息图，具有精度为10纳米的不对称微浮雕。由此产生的安全特征在视觉上易于控制，并且DOE能有效防止伪造。这些DOE在压纹全息图制造中使用标准技术很容易复制，可用于保护纸币、证券和文件免遭伪造。
