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Jansson, Roger
Publications (6 of 6) Show all publications
Wang, G., Arwin, H. & Jansson, R. (2004). Optimization of off-null ellipsometry in sensor applications. , 43(10), 2000-2005
Open this publication in new window or tab >>Optimization of off-null ellipsometry in sensor applications
2004 (English)Article in journal (Refereed) Published
Abstract [en]

The optimization of azimuth angle settings of a polarizer-compensator-sample-analyzer off-null ellipsometric sensor system to obtain maximum intensity changes with respect to changes in the properties of a sensing layer, with and without considering changes in a reflectance, is studied. Optimal conditions in the two cases are derived analytically under the assumption that linear relationships exist among the changes in the parameters of the sensing layer. The validity of these optimal conditions is verified by numerical examples. The advantage of using ellipsometry compared with reflectometry to readout sensing information for some sensing samples is also discussed. © 2004 Optical Society of America.

National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-41352 (URN)10.1364/AO.43.002000 (DOI)55653 (Local ID)55653 (Archive number)55653 (OAI)
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2013-10-14
Wang, G., Arwin, H. & Jansson, R. (2003). An optical gas sensor based on ellipsometric readout. Paper presented at 1st IEEE Conference on Sensors (SENSORS 2002), Orlando, Florida, USA, June 11-14 2002. IEEE Sensors Journal, 3(6), 739-743
Open this publication in new window or tab >>An optical gas sensor based on ellipsometric readout
2003 (English)In: IEEE Sensors Journal, ISSN 1530-437X, E-ISSN 1558-1748, Vol. 3, no 6, p. 739-743Article in journal (Refereed) Published
Abstract [en]

A gas sensor system based on ellipsometric readout is presented. It includes a gas chamber and a compact null ellipsometer operated in off-null mode. Small, low-cost optical components are used to demonstrate that this advanced methodology can be implemented in simplified instrumentation. The off-null ellipsometric sensing principle and transducer mechanisms of the sensing layers, as well as the instrumentation, are described. The application of the sensor system is exampled with experimental results on low-concentration alcoholic gases (methanol, ethanol, and 2-propanol) using porous silicon as a sensing layer. Optimization of the optics of the sensor system, improvement of sensitivity or alteration of selectivity by modification of sensing layers, and multisensing by using several ellipsometric units in parallel are discussed.

Place, publisher, year, edition, pages
IEEE: , 2003
Keywords
Alcohol detection, Off-null ellipsometry, Optical gas sensor, Porous silicon layers
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-46383 (URN)10.1109/JSEN.2003.820350 (DOI)000187735300012 ()
Conference
1st IEEE Conference on Sensors (SENSORS 2002), Orlando, Florida, USA, June 11-14 2002
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13Bibliographically approved
Arwin, H., Wang, G. & Jansson, R. (2003). Gas sensing based on ellipsometric measurement on porous silicon. Physica status solidi. A, Applied research, 197(2)
Open this publication in new window or tab >>Gas sensing based on ellipsometric measurement on porous silicon
2003 (English)In: Physica status solidi. A, Applied research, ISSN 0031-8965, E-ISSN 1521-396X, Vol. 197, no 2, p. 518-522Conference paper, Published paper (Other academic)
Abstract [en]

Ellipsometry has sufficient sensitivity for sensor applications and is here used as an optical readout method in a gas sensing system. Porous silicon is used as sensing layers in which vapors of solvents can adsorb and condensate due to capillary effects. A miniaturized multi-beam ellipsometer system is proposed and the concept is demonstrated by measurements on alcohol vapors. Optimization of the sensor system is discussed and improvement of sensitivity and alteration of selectivity by metal deposition in porous silicon layers are presented.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-46648 (URN)10.1002/pssa.200306556 (DOI)
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13
Wang, G., Arwin, H. & Jansson, R. (2003). Optimization of azimuth angle settings in polarizer-compensator-sample-analyzer off-null ellipsometry. Applied Optics, 42(1), 38-44
Open this publication in new window or tab >>Optimization of azimuth angle settings in polarizer-compensator-sample-analyzer off-null ellipsometry
2003 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 42, no 1, p. 38-44Article in journal (Refereed) Published
Abstract [en]

The dependence of the azimuth angle settings on the change in off-null intensity of a polarizer-.compensator-sample-analyzer ellipsometer owing to changes in sample properties is studied. First, a closed-form expression for the relationship between azimuth angles that fulfill the null condition is presented. An approximation for the off-null light intensity near null that is valid for small changes of the p- and s-reflection coefficients of an isotropic sample is then derived. This approximation shows that the intensity change near the null can be described by changes in the ellipsometric parameters tan q, and Delta only. Expressions for finding the azimuth angle that gives the maximum possible intensity change for a given change in the sample parameters are also derived. The importance of optimization of azimuth angle settings for different samples is investigated and found to depend on tan psi. Numerical and experimental results chosen from the investigation of gas sensors based on porous silicon are included to verify the approximations as well as the optimization. (C) 2003 Optical Society of America.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-48339 (URN)
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-12
Jansson, R., Zangooie, S., Kugler, T. & Arwin, H. (2001). Optical and microstructural characterization of thin films of photochromic fulgides. Journal of Physics and Chemistry of Solids, 62(7), 1219-1228
Open this publication in new window or tab >>Optical and microstructural characterization of thin films of photochromic fulgides
2001 (English)In: Journal of Physics and Chemistry of Solids, ISSN 0022-3697, E-ISSN 1879-2553, Vol. 62, no 7, p. 1219-1228Article in journal (Refereed) Published
Abstract [en]

Variable angle spectroscopic ellipsometry has been used for determining the optical properties, in terms of the complex dielectric function in the near UV-VIS-near IR spectral range, and the thicknesses of thin fulgide films of type E-a-(2,5-dimethyl-3-furyl)-ethylidene(adamantylidene)succinic anhydride and (E)-2-[a-(2,5-dimethyl-3-thienyl)ethylidene]-3-isopropylidenesuccinic anhydride. The films had thicknesses in the range 28-40 nm and were spin coated onto silicon substrates. To simultaneously extract film thicknesses and optical properties of the films, several methods of analysis were employed in order to decrease correlation between the fitting parameters in the optical model of the structure. In agreement with previous absorbance measurements done by others on similar materials in liquid or solid form, it was found that the fulgides studied have several resonances in the wavelength region below 400 nm and that new resonances appear in the middle of the visible region upon UV exposure. The ellipsometric analysis, as well as atomic force microscopy studies, showed that the films were very smooth with a root mean square surface roughness <0.4 nm and that a small thickness change of the film takes place upon UV exposure. Furthermore, AFM studies revealed that large phase changes take place when the samples are stored in darkness for several days, indicating that the materials are not stable in thin film form. © 2001 Elsevier Science Ltd.

Keywords
A. Organic compounds, D. Optical properties
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-47335 (URN)10.1016/S0022-3697(01)00012-9 (DOI)
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13
Jansson, R., Zangooie, S., Arwin, H. & Järrendahl, K. (2000). Characterization of 3C-SiC by spectroscopic ellipsometry. Physica status solidi. B, Basic research, 218(1), R1-R2
Open this publication in new window or tab >>Characterization of 3C-SiC by spectroscopic ellipsometry
2000 (English)In: Physica status solidi. B, Basic research, ISSN 0370-1972, E-ISSN 1521-3951, Vol. 218, no 1, p. R1-R2Article in journal (Refereed) Published
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-49787 (URN)
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-12
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