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Proceedings Paper

Formaldehyde sensing with plasmonic near-infrared optical fiber grating sensors
Author(s): Á. González-Vila; M. Debliquy; D. Lahem; P. Mégret; C. Caucheteur
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Paper Abstract

A tilted fiber Bragg grating is photo-inscribed in the core of a single-mode optical fiber, leading to the coupling of cladding mode resonances all along a wide region of the near-infrared spectrum. The grating is then coated with a thin film of gold in order to create a metal-dielectric interface. This way, light propagating through the cladding of the optical fiber is able to excite a surface plasmon wave on the outer interface. As sensitive element, a molecularly imprinted polymer is deposited by electropolymerization as a thin film around the previous gold coating. The thickness of the polymer is controlled by means of the surface plasmon resonance signature in order to preserve a correct surrounding refractive index sensitivity when used in a gaseous environment. The chosen polymer has an affinity to formaldehyde, which is a volatile organic compound worth to detect, especially because of its toxicity for the human being. We report a global wavelength shift of the grating cladding mode resonances in the presence of formaldehyde in gaseous state. This shift is due to a change in the refractive index of the polymer when it bounds to the target molecules. The sensor exhibits a linear response, together with a low limit of detection.

Paper Details

Date Published: 29 April 2016
PDF: 6 pages
Proc. SPIE 9899, Optical Sensing and Detection IV, 989917 (29 April 2016); doi: 10.1117/12.2227736
Show Author Affiliations
Á. González-Vila, Univ. de Mons (Belgium)
M. Debliquy, Univ. de Mons (Belgium)
D. Lahem, Materia Nova (Belgium)
P. Mégret, Univ. de Mons (Belgium)
C. Caucheteur, Univ. de Mons (Belgium)

Published in SPIE Proceedings Vol. 9899:
Optical Sensing and Detection IV
Francis Berghmans; Anna G. Mignani, Editor(s)

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