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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 nondispersive infrared (NDIR) absorption. The sensitivity of SF 6 gas detection is increased around ∼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 commercialdoi:10.1364/ome.3.000968 fatcat:gxo3yfgpk5ab5o37nzsk3f4pki