Lapidas Vasily, Cherepakhin Artem, Storozhenko Dmitriy, Gurevich Evgeny L, Zhizhchenko Alexey, Kuchmizhak Aleksandr A
Institute of Automation and Control Processes, Far Eastern Branch, Russian Academy of Science, 5 Radio Str., Vladivostok 690041, Russia.
Laser Center (LFM), University of Applied Sciences Munster, Stegerwaldstraße 39, 48565 Steinfurt, Germany.
Nano Lett. 2024 Oct 9;24(40):12590-12596. doi: 10.1021/acs.nanolett.4c03576. Epub 2024 Sep 27.
Femtosecond (fs) laser pulses drive matter into a highly nonequilibrium state, allowing precise sculpturing of irradiated surface sites with sophisticated nanomorphologies. Here, we used fs-laser patterning to create diverse plasmonic morphologies on the top Au layer of the metal-insulator-metal sandwich. Mutual action of laser-driven thermomechanical effects and ultrafast solid-to-liquid transition allows control of the morphology resulting in pronounced surface reflectivity modulation, i.e., in a structural color effect. This enables template-free high-resolution color printing at a superior lateral resolution up to 50000 dots per inch and facile tunability of the color tone and saturation. Moreover, precise control over the orientation of the printed nanostructures within subwavelength lattices allows modulation of their local plasmonic response encrypting the optical information within the colorful images. The hidden information can be unveiled using a facile cross-polarized optical visualization scheme, rendering the proposed method with extra modalities combining high resolution information encryption, coloring, and security labeling.
飞秒（fs）激光脉冲将物质驱动到高度非平衡状态，从而能够精确雕刻出具有复杂纳米形态的辐照表面位点。在此，我们使用飞秒激光图案化技术在金属-绝缘体-金属三明治结构的顶部金层上创建了多种等离子体形态。激光驱动的热机械效应与超快的固-液转变之间的相互作用使得能够控制形态，从而产生明显的表面反射率调制，即产生结构色效应。这使得无需模板即可实现高达每英寸50000点的卓越横向分辨率的高分辨率彩色打印，并且能够轻松调节色调和饱和度。此外，对亚波长晶格内印刷纳米结构的取向进行精确控制，可以调制其局部等离子体响应，从而在彩色图像中加密光学信息。可以使用简便的交叉偏振光学可视化方案揭示隐藏信息，从而使所提出的方法具有结合高分辨率信息加密、着色和安全标记的额外模式。
