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

Yoshiaki Nishijima, Yuta Adachi, Lorenzo Rosa, Saulius Juodkazis
2013 Optical Materials Express  
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 commercial
more » ... yroelectric detector. Down-sizing of IR-sensors to a sub-1 mm gas cell width, delivering ∼ 40 nM (or 1 ppm) of SF 6 sensitivity, can be foreseen with a simple source-detector setup.
doi:10.1364/ome.3.000968 fatcat:gxo3yfgpk5ab5o37nzsk3f4pki