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Mid-infrared (MIR) vibrational spectroscopy is a versatile tool for identifying organic compounds (OC) in gases or liquids in a label-free manner due to their unique molecular fingerprint, promoting a large variety of applications in biology, chemistry, medicine or environmental monitoring. Although new technologies like quantum-cascade lasers are rapidly evolving, the workhorse in this field is still Fourier-transform infrared (FTIR) spectrometry based on thermal sources. Without pre-treatment of the sample and/or enrichment of the OC of interest, those techniques offer a limit of detection (LOD) for compounds in aqueous environments at ppm levels [1]. Pushing this limit to ppb levels is commonly hindered by the lack of broadband, stable and bright MIR sources as well as of low-noise, high-dynamic-range MIR detectors.
© 2017 IEEE
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