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Laser absorption spectroscopy of oxygen confined in highly porous hollow sphere xerogel
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
2014 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 22, no 3, 2584-2594 p.Article in journal (Refereed) Published
Abstract [en]

An Al2O3 xerogel with a distinctive microstructure is studied for the application of laser absorption spectroscopy of oxygen. The xerogel has an exceptionally high porosity (up to 88%) and a large pore size (up to 3.6μm). Using the method of gas-in-scattering media absorption spectroscopy (GASMAS), a long optical path length (about 3.5m) and high enhancement factor (over 300 times) are achieved as the result of extremely strong multiple-scattering when the light is transmitted through the airfilled, hollow-sphere alumina xerogel. We investigate how the microphysical feature influences the optical property. As part of the optical sensing system, the material's gas exchange dynamics are also experimentally studied.

Place, publisher, year, edition, pages
2014. Vol. 22, no 3, 2584-2594 p.
Keyword [en]
Aerogels, Light, Scattering, Precursors, Media
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:kth:diva-142796DOI: 10.1364/OE.22.002584ISI: 000332518100044PubMedID: 24663551ScopusID: 2-s2.0-84893899243OAI: diva2:704696

QC 20140313

Available from: 2014-03-13 Created: 2014-03-12 Last updated: 2015-11-30Bibliographically approved

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He, Sailing
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Electromagnetic EngineeringZhejiang-KTH Joint Research Center of Photonics, JORCEP
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Atom and Molecular Physics and Optics

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