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题名	飞秒激光诱导材料表面亚波长周期结构及其着色效应研究
作者	李阳博
学位类别	硕士
答辩日期	2016
授予单位	中国科学院上海光学精密机械研究所
导师	赵全忠
关键词	超短脉冲激光，激光诱导周期性表面结构，激光着色，表面等离子激元
其他题名	Research on femtosecond laser induced subwavelength periodic surface structures and their colorization effect
中文摘要	材料表面，尤其是金属表面的着色具有重要的应用价值和发展前景。如：电子数码产品的品牌标识、装饰装潢等。传统的着色方法有，加工材料种类有限、加工精度低等缺点。激光诱导材料表面着色作为一种新的着色加工技术已经被研究了数十年。有着对加工环境要求低、可直接应用于大多数材料着色、加工精度高等优势，目前已有部分技术实现了工业化。本文正是基于此应用背景，研究了一种超短脉冲激光诱导材料表面着色的方法。通过聚焦超短脉冲激光辐照材料表面，诱导出亚波长的周期条纹结构。而周期条纹结构具有类光栅效应，在自然光照射下会沿着不同的方向衍射出不同波长，使被加工样品表面呈现出不同颜色。本文的主要工作和取得的主要成果有以下三个方面： 第一，我们对比了不同重复频率的飞秒脉冲激光辐照单晶硅表面诱导条纹结构的差异，研究了热累积效应对条纹结构形成的影响。得到了条纹结构的空间周期随着脉冲重叠率(脉冲数目)的增加而减小是由于材料占空比增加而引起的结论。 第二，聚焦飞秒激光扫描金属样品表面诱导出了周期结构。其在金属卤化物灯照明下呈现出结构色。通过测量样品表面在某一方向上的衍射谱我们系统地研究了结构色对样品水平旋转角和扫描行间距的依赖关系，得出了衍射峰强度（结构色亮度）受扫描行间距和样品水平旋转角线性调制，但衍射峰的中心波长(结构色的色调)不随两者变化的结论。 第三，基于国际光学照明委员会关于颜色差的规定，对飞秒激光在材料表面诱导出的结构色做了定量分析，结果表明颜色的均匀性随着加工面积的增大而变差，当加工面积达到64mm2时，边缘颜色差异已为人眼察觉。
英文摘要	The colorization of materials surfaces, especially the metal surfaces coloring have important application value. Such as: brand identity of digital electronic products, decoration etc. But there are several defects in traditional coloring techniques. Such as, narrow range of processing materials, low precision etc. As a new technique of colorization, laser induced material surfaces colorization has been researched for decades. It has many advantages. For instance, low environmental requirements, broad range of processing material and high precision. And some techniques have be industrialized. Based on this background, we systematically researched the ultrashort pulse laser induces colorization on material surface in this paper. By utilizing the ultrashort laser irradiating material surface, we induced subwavelength periodic structures. These structures have diffraction effect, diffract different wavelength in different direction when illuminated with white light. Then the processed samples present a variety of colors. The main results and conclusions of this paper have three aspects: Firstly, by comparing the difference of periodic surface structures induced by different repetition frequency femtosecond laser irradiating silicon surface, we studied the dependence of periodic structures formation on heat accumulative effect. It is concluded that the phenomenon of spatial period of structures decreases with the pulse overlapping (pulse number) increasing, is caused by the increase of the material duty cycle. Secondly, by focusing femtosecond laser to scan metal surface, we induced subwavelength periodic surface structures. While illuminating these structures with metal halide lamp, sample surfaces present structural colors. By measuring the diffraction spectrum of structural colors, we systematically study the dependences of structural color on scanning step and azimuthal angle. Results indicated that the intensity of diffraction peak (color brightness) could be linearly modulated by the scanning step and azimuthal angle, but the center wavelength of diffraction (color tone) do not shift with both of that. Thirdly, Based on the standard of color difference established by International Commission on Illumination, we quantitatively analyzed the color difference of structural colors induced by femtosecond laser. Results demonstrated that as the processing area increasing, the uniformity of structural color become worse. When the processing area increase to 64mm2, color difference in edge of processed region could be noticed.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/17023]
专题	上海光学精密机械研究所_学位论文
推荐引用方式 GB/T 7714	李阳博. 飞秒激光诱导材料表面亚波长周期结构及其着色效应研究[D]. 中国科学院上海光学精密机械研究所. 2016.

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