title: Surface Plasmon Resonance sensor showing enhanced sensitivity for CO2 detection in the mid-infrared range.
abstract: We present the first optical sensor based on Surface Plasmon Resonance (SPR) operating in the mid-infrared range. The experimental setup is based on a Kretschmann geometry with Ti/Au layers deposited on a CaF(2) prism where light excitation is provided by a Quantum Cascade Laser (QCL) source. Evidence of SPR is presented and the sensing capability of the system is demonstrated by using CO(2) and N(2) mixtures as test samples. Due to the absorption of CO(2) at this wavelength, it is shown that the sensitivity of this configuration is five times higher than a similar SPR sensor operating in the visible range of the spectrum.
authors.affiliation: Institute of Microtechnology, University of Neuchâtel, CH-2000 Neuchâtel, Switzerland. sylvain.herminjard@unine.ch
authors.forename: Sylvain
authors.initials: S
authors.lastname: Herminjard
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Sirigu
authors.forename: Hans Peter
authors.initials: HP
authors.lastname: Herzig
authors.forename: Eric
authors.initials: E
authors.lastname: Studemann
authors.forename: Andrea
authors.initials: A
authors.lastname: Crottini
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Pellaux
authors.forename: Tobias
authors.initials: T
authors.lastname: Gresch
authors.forename: Milan
authors.initials: M
authors.lastname: Fischer
authors.forename: Jérôme
authors.initials: J
authors.lastname: Faist
mesh_terms: D000042:Absorption; D002124:Calcium Fluoride / Q000737:chemistry; D002245:Carbon Dioxide / Q000032:analysis*; D006046:Gold; D007259:Infrared Rays; D009584:Nitrogen; D012031:Refractometry; D012680:Sensitivity and Specificity; D013055:Spectrophotometry, Infrared; D020349:Surface Plasmon Resonance; D014025:Titanium
chemical_list: D002245:Carbon Dioxide; D006046:Gold; D014025:Titanium; D009584:Nitrogen; D002124:Calcium Fluoride