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Plasmonic coloring of noble metals rendered by picosecond laser exposure

机译:皮秒激光曝光产生的贵金属的等离子着色

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We show the angle-independent coloring of metals in air arising from nanoparticle distributions on metal surfaces created via picosecond laser processing. Each of the colors is linked to a unique total accumulated fluence, rendering the process compatible with industry. We report the coating of the colored metal surfaces using atomic layer deposition which is shown to preserve colors and provide mechanical and chemical protection Laser bursts are composed of closely time-spaced pulses separated by 12.8 ns. The coloring of silver using burst versus non-burst is shown to increase the Chroma, or color saturation, by 50% and broaden the color Lightness range by up to 60%. The increase in Chroma and Lightness are accompanied by the creation of 3 kinds of different laser-induced periodic surface structures (LIPSS). One of these structures is measured to be 10 times the wavelength of light and are not yet explained by conventional theories. Two temperature model simulations of laser bursts interacting with the metal surface show a significant increase in the electron-phonon coupling responsible for the well-defined LIPSS observed on the surface of silver. Finite-difference time-domain simulations of nanoparticles distributed on the high-spatial frequency LIPSS (HSFL) explain the increase in color saturation (i.e. Chroma of the colors) by the enhanced absorption and enriched plasmon resonances.
机译:我们显示了通过皮秒激光加工在金属表面上产生的纳米粒子分布,导致空气中金属的角度独立着色。每种颜色都与唯一的总累积通量相关联,使该过程与行业兼容。我们报告了使用原子层沉积法对有色金属表面进行的涂层处理,该涂层可以保留颜色并提供机械和化学保护。激光脉冲由间隔时间为12.8 ns的紧密间隔的脉冲组成。使用爆裂和非爆裂对银进行着色可将色度(色彩饱和度)提高50%,并将色度范围扩大多达60%。色度和亮度的增加伴随着3种不同的激光诱导的周期性表面结构(LIPSS)的产生。这些结构之一被测量为光波长的10倍,并且尚未由常规理论进行解释。激光脉冲与金属表面相互作用的两个温度模型模拟表明,导致在银表面观察到的清晰LIPSS的电子-声子耦合显着增加。分布在高空间频率LIPSS(HSFL)上的纳米粒子的有限差分时域模拟说明了通过增强的吸收和富集的等离振子共振提高了色彩饱和度(即色彩的色度)。

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