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Proceedings Paper

THz quartz-enhanced photoacoustic sensor employing a quantum cascade laser source
Author(s): V. Spagnolo; P. Patimisco; S. Borri; A. Sampaolo; G. Scamarcio; M. S. Vitiello; H. E. Beere; D. A. Ritchie
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Paper Abstract

We report on an innovative quartz enhanced photoacoustic (QEPAS) gas sensor operating in the THz spectral range, employing a custom quartz tuning fork (QTF) with the two prongs spaced by ~800 μm. To test our sensor we employed a quantum cascade laser light source and selected a methanol rotational absorption line falling at 131.054 cm-1 (~3.93 THz), with line-strength S = 4.28•10-21 cm. The sensor operated at 10 Torr pressure on the QTF first flexion resonance frequency at 4245 Hz. We achieved a QEPAS normalized noise-equivalent absorption of 2•10-10 W·cm-1•Hz-1/2 comparable with the best result of mid-IR QEPAS systems.

Paper Details

Date Published: 31 January 2014
PDF: 11 pages
Proc. SPIE 8993, Quantum Sensing and Nanophotonic Devices XI, 899320 (31 January 2014); doi: 10.1117/12.2033620
Show Author Affiliations
V. Spagnolo, Univ. degli Studi di Bari, CNR-IFN (Italy)
P. Patimisco, Univ. degli Studi di Bari, CNR-IFN (Italy)
S. Borri, Univ. degli Studi di Bari, CNR-IFN (Italy)
A. Sampaolo, Univ. degli Studi di Bari, CNR-IFN (Italy)
G. Scamarcio, Univ. degli Studi di Bari, CNR-IFN (Italy)
M. S. Vitiello, NEST, Istituto Nanoscienze-CNR, Scuola Normale Superiore (Italy)
H. E. Beere, Univ. of Cambridge (United Kingdom)
D. A. Ritchie, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 8993:
Quantum Sensing and Nanophotonic Devices XI
Manijeh Razeghi; Eric Tournié; Gail J. Brown, Editor(s)

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