uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Stripline split-ring resonator with integrated optogalvanic sample cell
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. (Ion Physics)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. (ÅSTC)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. (Ion Physics)
Show others and affiliations
2014 (English)In: Laser Physics Letters, ISSN 1612-2011, Vol. 11, no 4, 045701- p.Article in journal, Letter (Refereed) Published
Abstract [en]

Intracavity optogalvanic spectroscopy (ICOGS) has been proposed as a method for unambiguous detection of rare isotopes. Of particular interest is 14C, where detection of extremely low concentrations in the 1:1015 range (14C:12C), is of interest in, e.g., radiocarbon dating and pharmaceutical sciences. However, recent reports show that ICOGS suffers from substantial problems with reproducibility. To qualify ICOGS as an analytical method, more stable and reliable plasma generation and signal detection are needed. In our proposed setup, critical parameters have been improved. We have utilized a stripline split-ring resonator microwave-induced microplasma source to excite and sustain the plasma. Such a microplasma source offers several advantages over conventional ICOGS plasma sources. For example, the stripline split-ring resonator concept employs separated plasma generation and signal detection, which enables sensitive detection at stable plasma conditions. The concept also permits in situ observation of the discharge conditions, which was found to improve reproducibility. Unique to the stripline split-ring resonator microplasma source of in this study, is that the optogalvanic sample cell has been embedded in the device itself. This integration enabled improved temperature control and more stable and accurate signal detection. Significant improvements are demonstrated, including reproducibility, signal-to-noise ratio and precision.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2014. Vol. 11, no 4, 045701- p.
Keyword [en]
Optogalvanic spectroscopy, Laser-assisted ratio analyzer, Split-ring resonator, microwave-induced microplasma source
National Category
Atom and Molecular Physics and Optics Fusion, Plasma and Space Physics Other Materials Engineering
Research subject
Physics; Engineering Science with specialization in Microsystems Technology
Identifiers
URN: urn:nbn:se:uu:diva-218769DOI: 10.1088/1612-2011/11/4/045701ISI: 000332768800011OAI: oai:DiVA.org:uu-218769DiVA: diva2:697157
Funder
Swedish Research Council, A0442201
Available from: 2014-02-17 Created: 2014-02-17 Last updated: 2015-05-12Bibliographically approved
In thesis
1. Miniature Plasma Sources for High-Precision Molecular Spectroscopy in Planetary Exploration
Open this publication in new window or tab >>Miniature Plasma Sources for High-Precision Molecular Spectroscopy in Planetary Exploration
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The prospect of finding life outside Earth has fascinated mankind for ages, and new technology continuously pushes the boundary of how remote and how obscure evidence we can find. Employing smaller, or completely new, types of landers and robots, and equipping them with miniature instruments would indeed revolutionize exploration of other planets and moons.

In this thesis, microsystems technology is used to create a miniature high-precision isotope-resolving molecular spectrometer utilizing the optogalvanic effect. The heart of the instrument, as well as this thesis, is a microplasma source.

The plasma source is a split-ring resonator, chosen for its simplicity, pressure range and easily accessible plasma, and modified to fit the challenging application, e.g., by the adding of an additional ground plane for improved electromagnetic shielding, and the integration of microscopic plasma probes to extract the pristine optogalvanic signal.

Plasma sources of this kind have been manufactured in both printed circuit board and alumina, the latter for its chemical inertness and for compatibility with other devices in a total analysis system. From previous studies, classical optogalvanic spectroscopy (OGS), although being very sensitive, is known to suffer from stability and reproducibility issues. In this thesis several studies were conducted to investigate and improve these shortcomings, and to improve the signal-to-noise ratio. Moreover, extensive work was put into understanding the underlying physics of the technique.

The plasma sources developed here, are the first ever miniature devices to be used in OGS, and exhibits several benefits compared to traditional solutions. Furthermore, it has been confirmed that OGS scales well with miniaturization. For example, the signal strength does not decrease as the volume is reduced like in regular absorption spectroscopy. Moreover, the stability and reproducibility are greatly increased, in some cases as much as by two orders of magnitude, compared with recent studies made on a classical OGS setup. The signal-to-noise ratio has also been greatly improved, e.g., by enclosing the sample cell and by biasing the plasma. Another benefit of a miniature sample cell is the miniscule amount of sample it requires, which can be important in many applications where only small amounts of sample are available.

To conclude: With this work, an important step toward a miniature, yet highly performing, instrument for detection of extraterrestrial life, has been taken.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2015. 53 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1253
Keyword
MEMS, MST, Optogalvanic Spectroscopy, Molecular Spectroscopy, Split-Ring Resonator, Microplasma
National Category
Physical Sciences Engineering and Technology
Research subject
Engineering Science with specialization in Microsystems Technology
Identifiers
urn:nbn:se:uu:diva-251315 (URN)978-91-554-9245-8 (ISBN)
Public defence
2015-06-05, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2015-05-11 Created: 2015-04-15 Last updated: 2015-07-07

Open Access in DiVA

Post-print version(483 kB)465 downloads
File information
File name FULLTEXT01.pdfFile size 483 kBChecksum SHA-512
9a26b097e63b13c0f9aa2238f7ad92246e2ac3f8a05044c5bfb5fc5171301e7e7c742784984b7e24c41e16f01d94a61cedaaa3bfcae4a7c7c0121266d29dc1bb
Type fulltextMimetype application/pdf

Other links

Publisher's full texthttp://iopscience.iop.org/1612-202X/11/4/045701/

Authority records BETA

Persson, AndersBerglund, MartinThornell, GregerPossnert, GöranSalehpour, Mehran

Search in DiVA

By author/editor
Persson, AndersBerglund, MartinThornell, GregerPossnert, GöranSalehpour, Mehran
By organisation
Applied Nuclear PhysicsMicrosystems Technology
Atom and Molecular Physics and OpticsFusion, Plasma and Space PhysicsOther Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 465 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 1442 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf