Infrared microcalorimetric spectroscopy using quantum cascade lasers

Journal Article · Tue Jan 01 04:00:00 EST 2013 · Optics Letters

DOI:https://doi.org/10.1364/OL.38.000507· OSTI ID:1063144

Morales Rodriguez, Marissa E ^[1]; Senesac, Larry R ^[1]; Rajic, Slobodan ^[1]; Lavrik, Nickolay V ^[1]; Smith, Barton ^[1]; Datskos, Panos G ^[1]

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1. ORNL

We have investigated an infrared (IR) microcalorimetric spectroscopy technique that can be used to detect the presence of trace amounts of target molecules. The chemical detection is accomplished by obtaining the IR photothermal spectra of molecules absorbed on the surface of uncooled thermal micromechanical detectors. IR microcalorimetric spectroscopy requires no chemical specific coatings and the chemical specificity of the presented method is a consequence of the wavelength-specific absorption of IR photons from tunable quantum cascade lasers due to vibrational spectral bands of the analyte. We have obtained IR photothermal spectra for trace concentrations of RDX and a monolayer of 2-mercaptoethanol, over the wavelength region from 6 to 10 m. We found that in this wavelength region both chemicals exhibit a number of photothermal absorption features that are in good agreement with their respective IR spectra.

• Research Organization: Oak Ridge National Laboratory (ORNL); Center for Nanophase Materials Sciences
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1063144
• Journal Information: Optics Letters, Journal Name: Optics Letters Journal Issue: 4 Vol. 38; ISSN 0146-9592
• Country of Publication: United States
• Language: English

Related Subjects

IR specttoscopy
MEMS