Diamonds are a Spectroscopist’s Best Friend: Thin Film Diamond Mid-Infrared Waveguides for Advanced Chem/Bio Sensors
2014 (English)In: Analytical Chemistry, ISSN 0003-2700, E-ISSN 1520-6882, Vol. 86, no 16, 8136-8141 p.Article in journal (Refereed) Published
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.
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
IdentifiersURN: urn:nbn:se:uu:diva-228151DOI: 10.1021/ac5011475ISI: 000340701500018OAI: oai:DiVA.org:uu-228151DiVA: diva2:732692