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THz QCL-Based Cryogen-Free Spectrometer for in Situ Trace Gas Sensing

  Articoli su Riviste JCR/ISI  (anno 2013)

Autori:  Consolino L., Bartalini S., Beere H. E., Ritchie D. A., Vitiello M. S., De Natale P

Affiliazione Autori:  CNR, Istituto Nazionale di Ottica and LENS (European Laboratory for Non-linear Spectroscopy), Via Carrara 1, Sesto Fiorentino (FI) 50019, Italy; Cavendish Laboratory, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE, United Kingdom; NEST, CNR, Istituto Nanoscienze and Scuola Normale Superiore, Piazza San Silvestro 12, Pisa 56127, Italy

Riassunto:  We report on a set of high-sensitivity terahertz spectroscopy experiments making use of QCLs to detect rotational molecular transitions in the far-infrared. We demonstrate that using a compact and transportable cryogen-free setup, based on a quantum cascade laser in a closed-cycle Stirling cryostat, and pyroelectric detectors, a considerable improvement in sensitivity can be obtained by implementing a wavelength modulation spectroscopy technique. Indeed, we show that the sensitivity of methanol vapour detection can be improved by a factor approximate to 4 with respect to standard direct absorption approaches, offering perspectives for high sensitivity detection of a number of chemical compounds across the far-infrared spectral range.

Rivista/Giornale:  SENSORS
Volume n.:  13 (3)      Pagine da: 3331  a: 3340
Ulteriori informazioni:  This work was partly supported by the Italian Ministry of Education, University, and Research (MIUR) through the program \"FIRB-Futuro in Ricerca 2010\" RBFR10LULP \"Fundamental research on terahertz photonic devices\". We acknowledge Davide Mazzotti for his valuable contribution and discussions.
DOI: 10.3390/s130303331

*Impact Factor della Rivista: (2013) 2.048   *Citazioni: 34
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  19/05/2019

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