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Infrared microcalorimetric spectroscopy using quantum cascade lasers |
Optics Letters, Vol. 38, Issue 4, pp. 507-509 (2013)
http://dx.doi.org/10.1364/OL.38.000507
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Abstract
We have investigated an 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 adsorbed on the surface of uncooled thermal micromechanical detectors. Although we use a chemical layer to absorb target molecules, IR microcalorimetric spectroscopy requires no chemical specific coatings. 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 1,3,5-Trinitroperhydro-1,3,5-triazine and a monolayer of 2-Sulfanylethan-1-ol (2-mercaptoethanol) over the wavelength region from 6 to 10 μm. We found that both chemicals exhibit a number of photothermal absorption features that are in good agreement with their respective IR spectra.
© 2013 Optical Society of America
OCIS Codes
(040.3060) Detectors : Infrared
(240.0310) Optics at surfaces : Thin films
ToC Category:
Optics at Surfaces
History
Original Manuscript: November 15, 2012
Revised Manuscript: January 2, 2013
Manuscript Accepted: January 7, 2013
Published: February 12, 2013
Virtual Issues
Vol. 8, Iss. 3 Virtual Journal for Biomedical Optics
Citation
M. E. Morales-Rodríguez, L. R. Senesac, S. Rajic, N. V. Lavrik, D. B. Smith, and P. G. Datskos, "Infrared microcalorimetric spectroscopy using quantum cascade lasers," Opt. Lett. 38, 507-509 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-4-507
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