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New methodology for optical sensing and analysis
Linköping University, Department of Physics, Chemistry and Biology, Applied Optics . Linköping University, The Institute of Technology.
2004 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis describes the research I have done, and partly will do, during my time as a PhD student in the laboratory of Applied Optics at Linköping University. Due to circumstances beyond the scope of this book, this incorporates three quite different projects. The first two, involving gas sensing and measuring on paper with ellipsometry, have been discontinued, whereas the third one, measuring fluorescence with a computer screen and web camera, is in full progress and will be until I complete my studies.

Thus the purpose of this work also has several aspects. Partly, it describes performed research and its results, as well as theoretical background. On the other hand, it provides practical and theoretical background necessary for future work. While the three projects are truly quite different, each of them has certain things in common with each of the other. This is certainly also true for the necessary theory. Two of them involve spectroscopic ellipsometry, for example, while another pair needs knowledge of color theory, etc. This makes it impossible to separate the projects, despite of their differences. Hopefully, these links between the different projects, connecting the different chapters, will make this work whole and consistent in its own way.

Place, publisher, year, edition, pages
Institutionen för fysik, kemi och biologi , 2004. , 51 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1090
Keyword [en]
Applied Optics, measuring, ellipsometry, fluorescence, spectroscopic ellipsometry
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-5670ISBN: 91-7373-944-8 (print)OAI: oai:DiVA.org:liu-5670DiVA: diva2:21434
Presentation
2004-04-29, 00:00 (English)
Note
Report code: LiU-TEK-LIC-200 4-19. On the day of the public defence the status of article I was: In press and the status of article III was: Manuscript and has a new title. The old title was Computer screen photo-assisted spectroscopic fluorimetry.Available from: 2004-12-10 Created: 2004-12-10 Last updated: 2009-02-26
List of papers
1. Improvement of porous silicon based gas sensors by polymer modification
Open this publication in new window or tab >>Improvement of porous silicon based gas sensors by polymer modification
2003 (English)In: Physica Status Solidi (A), ISSN 0031-8965, Vol. 197, no 2, 378-381 p.Article in journal (Refereed) Published
Abstract [en]

Gas sensing was performed using spectroscopic ellipsometry and porous silicon films. Modification of the porous layer by polymer deposition showed an increase in sensitivity to organic solvent vapor of up to 135%. The increase in sensitivity is strongly dependent on polymer concentration. At high concentrations, too much polymer is deposited, presumably blocking the pores, causing a decrease in sensitivity. At sufficiently low concentrations, the polymer causes a strong increase in sensitivity. This is assumed to be caused by the polymer being deposited inside the pores, where its interaction with the vapor influences the sensitivity. At very low concentration, the sensitivity approaches values obtained without polymer modification. The sensitivity increase is different for different vapors, pointing to possible selectivity enhancement.

Keyword
07.07.Df, 61.43.Gt, 78.67.Bf, 82.35.Gh
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-13772 (URN)10.1002/pssa.200306529 (DOI)
Available from: 2004-12-10 Created: 2004-12-10 Last updated: 2013-10-14
2. Determination of refractive index of printed and unprinted paper using spectroscopic ellipsometry.
Open this publication in new window or tab >>Determination of refractive index of printed and unprinted paper using spectroscopic ellipsometry.
2004 (English)In: Thin Solid Films, ISSN 0040-6090, Vol. 455-456, 361-365 p.Article in journal (Refereed) Published
Abstract [en]

An attempt is made to address the basic physical properties of printed and unprinted paper surfaces by using spectroscopic ellipsometry in the range 300–900 nm to determine the effective complex-valued refractive index N. Some simulations to address the effect of structural properties have also been done and a qualitative comparison with some other methods, in particular Brewster angle measurements, has been made. Unprinted paper and paper printed in different colors have been studied. The measured absorption properties matched the colors of the used inks well. The effects of roughness on the determined spectra of N are discussed. Simulations show that compared to other methods, like Brewster-angle reflectometry, spectroscopic ellipsometry provides a more accurate value of N, especially in wavelength regions were the color pigments show absorption.

Keyword
Spectroscopic ellipsometry; Paper surfaces; Optical properties; Gloss variation
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-13773 (URN)10.1016/j.tsf.2004.01.024 (DOI)
Available from: 2004-12-10 Created: 2004-12-10 Last updated: 2013-10-14
3. Enhancing classification capabilities of computer screen photo-assisted fluorescence fingerprinting
Open this publication in new window or tab >>Enhancing classification capabilities of computer screen photo-assisted fluorescence fingerprinting
2005 (English)In: Sensors and Actuators B: Chemical, ISSN 0925-4005, Vol. 110, no 2, 190-194 p.Article in journal (Refereed) Published
Abstract [en]

The separation of emission from transmitted light for the fingerprinting of fluorescent substances using a computer screen photo-assisted technique (CSPT) is demonstrated. CSPT is a technique for optical evaluation using a simple cell with just a standard computer set and a web camera as instrumentation. It has been demonstrated to be a versatile system for colorimetric and fluorescent fingerprinting. Here the omnidirectional property of fluorescent emission is utilized to separate it from the background, using a simple optical arrangement compatible with CSPT purposes. This enhances the classification capabilities and makes classification at sub-μM concentrations possible.

Keyword
Computer screen photo-assisted technique; Fluorescence; Spectral fingerprinting; Bioassays; Home tests
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-13774 (URN)10.1016/j.snb.2005.01.046 (DOI)
Available from: 2004-12-10 Created: 2004-12-10 Last updated: 2009-09-08

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Bakker, Jimmy W. P.

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