Comparative Analysis of Articles: Assignment in Me2001

Topics: Diffraction, Experiment, Diffraction grating Pages: 7 (2424 words) Published: December 4, 2012
Comparative analysis of articles: assignment in ME2001

Identification code: obu047

Résumé of Femtosecond laser color marking of metal and semiconductor surfaces This article starts off with an abstract and an introduction. The abstract describes short what is tested. “Color marking of rough or smooth metal (Al, Cu, Ti) and semiconductor (Si) surfaces was realized via femtosecond laser fabrication of periodic surface nanorelief, representing one-dimensional diffraction gratings.” (Ionin, Kudryashov, Makarov, & Seleznev, 2012) It continues with theory of it. In the introduction there is a more elaborated theoretical framework of previous research and an explanation of why “However, this coloration principle lacks homogeneous color brightness, since the nanogratings efficiency will vary for different diffraction angles.” (Ionin, Kudryashov, Makarov, & Seleznev, 2012) And how “spatial color variation across the surface of interest can be provided by changing the actual gratingperiod via variation of the incidence angle θ of the laser radiation with the wavelength λ.” (Ionin, Kudryashov, Makarov, & Seleznev, 2012) they will do this study. The next part is experimental setup and procedures which describes the setup of the experiment (fig 1) and furthermore information, like which microscope they used (Levenhuk BioView 630 or Olympus BX-51) so the reader could replicate this experiment. After the setup there is an experimental results and discussion section which provides information about the nanogratings and nanostructures (fig 2 and 3) and also an more depth analysis of these findings (fig 4-7). The conclusion provides the answers to the introduction which should be demonstrated. It gives a brief what the experiment was about and how they used it and provided the findings “Different bright colors covering the entire visible range, were shown to be provided not by grating rotation on a surface, but via pre-determined angularly controlled variation of surface grating periods, while additional surface darkening was realized by high-fluence surface microstructuring.” (Ionin, Kudryashov, Makarov, & Seleznev, 2012)

Analysis of Femtosecond laser color marking of metal and semiconductor surfaces First of all it is a very good structure, it’s to understanding because it’s divided into four main topics, introduction, experimental setup and procedures, experimental results and discussion and finally a conclusion, it is very easy to follow. The coherence in this article is good. By first introduce you to the subject by the title, example it by experiments and in the end present the findings. The logic is the same here, it’s good since they first of present the ideas and following them. However to have full clearness about this article it requires knowledge about the area and it would also give a more deep understanding about this research and it’s possibilities. All part follow the logic of first presenting, exemplifying and then show the results, it is very easy to follow this report. This is also shown in the referencing to tables and figures to the text they are used well and it’s easy to follow as a reader.

To follow as a reader is easy because it is sufficient text by the figures and they easy explain the purpose of them. In other words it is possible to understand main purpose of figure of table even without the figure. The title describes the area they are targeting. But they could be more specific with an under title saying it’s an experiment on different materials and describes its applications or whom it’s for. But then again it certainly makes me interesting in the article The abstract should be longer since it does not cover all aspects in the article. The background/motivation/problem-statement is not sufficient. Results/findings/conclusion is also not sufficient because it’s only a conclusion and not so much results. Earlier researchers of coloration principle lack homogeneous color brightness, since the...
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