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We demonstrate the use of plasmonic extraordinary transmission at IR wavelengths for surface-enhanced infrared absorption (SEIRA) spectroscopy in gas sensing. Gas detection was performed through non-dispersive infrared (NDIR) absorption. The sensitivity of SF6 gas detection is increased around similar to 27 times with metal hole array (MHA) microstructures placed on the gas cell mirrors, as compared with non-structured mirrors; an absorption change of 2% per 100 ppm was obtained on a standard commercial pyroelectric detector. Down-sizing of IR-sensors to a sub-1 mm gas cell width, delivering similar to 40 nM (or 1 ppm) of SF6 sensitivity, can be foreseen with a simple source-detector setup. (C) 2013 Optical Society of Americ

Augmented sensitivity of an IR-absorption gas sensor employing a metal hole array