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Diamonds are a Spectroscopist’s Best Friend: Thin Film Diamond Mid-Infrared Waveguides for Advanced Chem/Bio Sensors
Institute of Analytical and Bioanalytical Chemistry, University of Ulm.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
Institute of Analytical and Bioanalytical Chemistry, University of Ulm.
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2014 (English)In: Analytical Chemistry, ISSN 0003-2700, E-ISSN 1520-6882, Vol. 86, no 16, 8136-8141 p.Article in journal (Refereed) Published
Abstract [en]

The first combination of mid-infrared (MIR) tunable quantum cascade lasers (tQCLs) with thin film diamond strip waveguides (DSWG) suitable for advanced chem/bio sensing is demonstrated. The sensing system comprises thin diamond films grown on surface- passivated Si wafers via chemical vapor deposition (CVD) and microstructured using inductively coupled plasma (ICP) etching, serving as photonic waveguide for radiation emitted by a broadly tunable quantum cascade laser (tQCL) in the spectral regime of 5.78-6.35 µm (1570-1730 cm-1). The characterization of the freestanding diamond waveguides reveals excellent transmission properties across a broad MIR band. As a proof of concept, the detection of acetone in D2O via evanescent field absorption is demonstrated achieving a limit of detection (LOD) as low as 200 pL, which indicates a significant sensitivity improvement compared to conventional MIR slab/strip waveguides reported to date. Providing characteristic absorption features within the tuning range of the tQCL, studies using anisaldehyde as analyte further corroborate the potential of tQCL-DSWG-based chem/bio sensors.

Place, publisher, year, edition, pages
2014. Vol. 86, no 16, 8136-8141 p.
National Category
Analytical Chemistry Engineering and Technology
Research subject
Chemistry with specialization in Analytical Chemistry; Engineering Science with specialization in Solid State Physics; Engineering Science with specialization in Materials Science
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URN: urn:nbn:se:uu:diva-228151DOI: 10.1021/ac5011475ISI: 000340701500018OAI: oai:DiVA.org:uu-228151DiVA: diva2:732692
Available from: 2014-07-04 Created: 2014-07-04 Last updated: 2017-12-05

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Karlsson, MikaelForsberg, PontusNikolajeff, FredrikÖsterlund, Lars

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