在近渗滤等离子体反射器阵列上写入明亮颜色的Laser
Laser writing of bright colours on near-percolation plasmonic reflector arrays
摘要：
通过表面纳米结构化的着色由于利用环境友好的可回收材料和产生非漂白颜色而吸引了大量关注[1-8]。最近，人们发现可以将彩色打印的任务委托给激光后处理，以修改精心设计和制造的纳米结构[9，10]。在这里，我们采取了结构彩色打印发展的下一个关键步骤，即放弃预制的纳米结构，而使用介电金属三明治顶部的近渗滤金属膜，即，近渗滤等离子体反射器阵列。用强聚焦的钛蓝宝石激光束快速扫描（~ 20 μm/s）在100 nm厚的金层上由30 nm薄的二氧化硅层支撑的4 nm薄的岛状金膜，同时将平均激光功率从1调整到10 mW，我们通过激光加热诱导的金岛的合并和重塑产生从绿色到红色的明亮颜色。强烈加热的岛的选择和它们的重塑，都源于等离子体共振的激发，受到激光照射的偏振方向的强烈影响，因此只有当用相同的偏振观察时，产生的颜色才很明显。相反，具有圆偏振的激光彩色写入产生明亮的偏振无关的彩色图像。近逾渗反射器阵列的制造过程非常简单，可大规模生产，而激光诱导的修改固有地发生在亚波长分辨率。这种独特的显着特征的组合使得为激光彩色书写开发的方法易于实际实施，并在从用于安全标记的纳米级图案到用于装饰的大规模彩色印刷的各种应用中使用。
英文摘要：
Colouration by surface nanostructuring has attracted a great deal of attention by the virtue of making use of environment-friendly recyclable materials and generating non-bleaching colours [1-8]. Recently, it was found possible to delegate the task of colour printing to laser post-processing that modifies carefully designed and fabricated nanostructures [9,10]. Here we take the next crucial step in the development of structural colour printing by dispensing with preformed nanostructures and using instead near-percolation metal films atop dielectric-metal sandwiches, i.e., near-percolation plasmonic reflector arrays. Scanning rapidly (~ 20 μm/s) across 4-nm-thin island-like gold films supported by 30-nm-thin silica layers atop 100-nm-thick gold layers with a strongly focused Ti-sapphire laser beam, while adjusting the average laser power from 1 to 10 mW, we produce bright colours varying from green to red by laser-heating-induced merging and reshaping of gold islands. Selection of strongly heated islands and their reshaping, both originating from the excitation of plasmonic resonances, are strongly influenced by the polarization direction of laser illumination, so that the colours produced are well pronounced only when viewed with the same polarization. Conversely, the laser colour writing with circular polarizations results in bright polarization-independent colour images. The fabrication procedure for near-percolation reflector arrays is exceedingly simple and scalable to mass production, while the laser-induced modification occurs inherently with the subwavelength resolution. This unique combination of remarkable features makes the approach developed for laser colour writing readily amenable for practical implementation and use in diverse applications ranging from nanoscale patterning for security marking to large-scale colour printing for decoration.
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