Comparative Analysis of Articles: Assignment in Me 2001 Essay

Resume 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 ? of the laser radiation with the wavelength ?. (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).

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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 nanogratings ef?ciency will vary for different diffraction angles. In this case they try a new method, by changing the actual grating period via variation of the incidence angle ? of the laser radiation with the wavelength ? and it should give a more coloration. In the introduction there is a theoretical framework which gives example of earlier researches which gives this research meaning and extension which previous researchers could use. As this is a research approached with an experimental setup and analysis.

This is also how data is collected and analyzed. It is a very good experimental section which shows the setup and for instance which laser they are using which would be enough information to replicate the study. Besides this It’s very good logic in this article. They have presented the introduction of why they should do this experiment and then test it and analysis it. It also has a conclusion about what have come out of this experiment. The data is used by samples which have been tested on the specific materials like copper and aluminum.

The article presents the finding in images and text. The images clearly show the nanogratings and the nanostructured lines and it gives more clearness to the text. These results are based on the experiment and therefore the theoretical and statistical analysis is not provided. The results is by the coloring of Si, Al, Cu and Tisurfaces shows the most efficient coloration for the atom- ically smooth surface of the Si wafers, somewhat weaker coloration of the optical-quality Ti surfaces, and highly inhomogeneous (polychromatic) coloration of the mechanically polished Al and Cu surfaces.

And these results are all included in the conclusion. They also seem reasonable because they link back to the introduction it have given me more understanding about this method, which was my purpose. Resume of Controlled nanostructrures formation by ultra-fast laser pulses for color marking The article begins with an abstract which first describes why it is an interesting topic to research. “Precise nanostructuration of surface and the subsequent upgrades in material properties is a strong outcome of ultra-fast laser irradiations.

Material characteristics can be designed on mesoscopic scales, carrying new optical properties. ” (Dusser, o. a. , 2009) The introduction gives first a description of the possibilities of this topic. It also gives a short brief of previous research on this topic on structural formation on surfaces. It continues with a more deep questioning about this topic and also narrowing this paper to a specific topic. “The scope of the present work is to show how the obtained nanostructures with ultra-short laser pulses can be precisely controlled, and used to obtain needed optical diffractive effects. (Dusser, o. a. , 2009) Furthermore is also a statement that “Color effect due to the diffraction of light by periodic structures on metallic surfaces has already been evidenced. “And the work in this article will be to control this effect, make a color picture, transferred, on a metallic surface or in other words “present work focuses on giving details on the experimental procedure to obtain such results. ” (Dusser, o. a. , 2009) (Result is fig 1) The article continues with an experimental section which gives enough information about this experiment to recreate it.

This information is divided into two experimental setups, one for writing and one for reading. The writing is setup as a femtosecond laser is beaming into a beamsplitter which will provide two beams, one goes in a mirror (Hurryscan) and second beam goes into a Achormat doublet lenses, which will be analyzed in this article. The reading setup is how to calibrate the reading tool (scanner) and the “color variations on the scanned picture of a marked material are due to the scanner’s light diffraction on the nanostructures” (Dusser, o. . , 2009) Figure 2 and 3 show how they should be set. The independent variables wavelengths and what was measured, the dependent variables, ripples. Results and discussion is provided in Ripples formation and Color effect reading. To shorten this very short the ripples formation which are obtained on the steel as poloration of the induced color effect. The color effect is to read the nanostructures in the light diffraction and it is used to read very precisely the nanostructures orientations.

Or in other words “two experimental methods, discussed in experimental section, have been used to mark samples. One is point by point marking and the second one is spot overlapping process marking. ” (Dusser, o. a. , 2009) Section four is illustrating color printing process by the oriented nanostructures. The results are shown in figure 12. The conclusion gives an explanation of the experiment and the topic of the article Nanostructures generated by ultra-short pulses produce colored shapes on a metal surface by diffraction process, and can be designed as the colors of a painter.

Composed of nanostructures, with a user defined orientation associated with laser polarization, the assembly allows returning a pre-defined picture thanks to a suitable colorimetric calibration. ” (Dusser, o. a. , 2009) And that it can be used in many different applications which this topic is useful. Analysis of Controlled nanostructrures formation by ultra-fast laser pulses for color marking It’s a good structure with an introduction in the beginning and later on comes an experimental section which is divided into a setup and how to read this setup.

This gives a deep understanding about the experiment. Furthermore is a result and discussion section, this is good because it’s clear what the topic is, if it was the topic. And section 4 is color printing process by oriented nanostructures which have been included as a new topic since that part should be emphasized as the illustration which is very good. In the end is a conclusion. It’s not really clear if it’s conclusion of the result or discussion. In my opinion discussion should be last which include short critic of the work, improvements and also how to continue this work.

An overall coherency is very good, each topic is presented well with good headings to follow and this gives the logic of the article meaning and understanding. The overall clearness is very good, however, it is required for the reader to have knowledge about the topic to have a critical mindset. For more clearness the conclusions could be answer the questions from the introduction as a matrix because it would give them more transparency, less time consuming to understand, easy to remember and also easier to go back to Also for this clearness there is reference to figures in the text which makes it easier to follow the text in the article.

There is also sufficient text about tables and figures that make the reader understand main purpose of figure even without the figure even though some of the figures gives the reader an more understanding of the possibilities of this method. It’s a clear title which gives and understanding of what this article will be about. Furthermore the abstract also gives the reader an understanding and more depth first impression which include all parts in the article.

In the introduction it narrows the scope of the present work and what it is for, to show how the obtained nanostructures with ultra short laser pulses can be precisely controlled, and used to obtain needed optical diffractive effects. However earlier research shows color effect due to the diffraction of light by periodic structures on metallic surfaces has already been evidenced and it’s now extended. This is provided with an experimental setup and analysis of the samples and measurements.

For the purpose of this it will beyond these results, demonstrate how to control such properties in order to transfer information on a metallic surface using this specific effect. The method to do this will be, in practice, two experimental methods, discussed in experimental section, are used (Dusser, o. a. , 2009) to mark samples. One is point by point marking and the second one is spot overlapping process marking. The data was collected with samples and analyzing them.

There is also it is a very good experimental section which shows the setup and for instance which laser they are using to give enough information to replicate the study Following the logic of the research process is very easy because it is shown very well what are the writing and reading and how the experiments are performed. Results are presented as analysis of images and how they have performed Conclusions are supported clearly by results and they seem reasonable however my knowledge about how each laser work is very limited.

The conclusion also relate back to introduction and purpose because it is the experiment and its findings. The questions are also answered to my satisfactory because it is a very interesting area and possible applications of it. Comparison The main differences are structure, in femtosecond laser color marking of metal and semiconductor surfaces (article A) compared to controlled nanostructures formation by ultrafast laser pulses for color marking (article B). Article A has been shorten more than article B and some areas it could be more elaboration of the topic, this could be in all topics.

The main similarities are, because they are both based on experiments, how they have shown and describe each experiment. Both these article use experiment as their study and the main similarities in these articles is how they show how to replicate and describe the experiments. Example setup and description of it The strengths of article B is that it showed more understanding why, how the experiment work and its possibilities. There were not enough elaboration for article A and this could be because it didn’t have similar text lengths.

However because article A was short is easier to find each important data or the best parts of the article. I would give this analysis an A because every subject have been analyzed and compared to the criteria of A and also because this text is limited, there have been sacrifices that have not been included

Bibliography

Dusser, B. , Sagan, Z. , Soder, H. , Faure, N. , Colombier, J. , Jourlin, M. , o. a. (2009). Controlled nanostructrures formation by ultra. Optical Society of America (OSA), 12. Ionin, A. A. , Kudryashov, S. I. , Makarov, S. V. , ; Seleznev, L. V. (2012).

Femtosecond laser color marking of metal and semiconductor. Springer-Verlag , 6. Femtosecond laser color marking of metal and semiconductor surfaces http://rd. springer. com/article/10. 1007/s00339-012-6849-y Controlled nanostructrures formation by ultra fast laser pulses for color https://www. google. com/search? hl=sv;q=Controlled+nanostructrures+formation+by+ultra+ +fast+laser+pulses+for+color second link in the search because … …this link gives error when copy to the web browser even though it is the pdf. http://hal-ujm. ccsd. cnrs. fr/docs/00/50/15/10/PDF/DUSSER_OE_Revision_ARTICLE_2. pdf