地形彩色等离子硬币
Topographical coloured plasmonic coins
摘要：
随着等离子体激元学的发展，利用金属纳米结构进行着色已经引起了人们的极大兴趣。然而，目前基于等离子体概念的自上而下的着色方法是繁琐和耗时的，因此对于大规模工业应用是不可行的。在这里，我们展示了一种自下而上的方法，在皮秒激光曝光后，可以在贵金属上创建与视角无关的全色调色板。我们表明，颜色与一个单一的激光加工参数，总累积通量，这使得该过程适合于高吞吐量的工业应用。激光照射表面的统计图像分析揭示了控制颜色的纳米颗粒尺寸的各种分布。实验和大规模时域有限差分计算之间的定量比较表明，颜色是由异质纳米团簇中的选择性吸收现象产生的。因此，等离子体团簇共振被发现在颜色形成中发挥关键作用。
英文摘要：
The use of metal nanostructures for colourization has attracted a great deal of interest with the recent developments in plasmonics. However, the current top-down colourization methods based on plasmonic concepts are tedious and time consuming, and thus unviable for large-scale industrial applications. Here we show a bottom-up approach where, upon picosecond laser exposure, a full colour palette independent of viewing angle can be created on noble metals. We show that colours are related to a single laser processing parameter, the total accumulated fluence, which makes this process suitable for high throughput industrial applications. Statistical image analyses of the laser irradiated surfaces reveal various distributions of nanoparticle sizes which control colour. Quantitative comparisons between experiments and large-scale finite-difference time-domain computations, demonstrate that colours are produced by selective absorption phenomena in heterogeneous nanoclusters. Plasmonic cluster resonances are thus found to play the key role in colour formation.
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