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

• DOI: 10.1364/ome.3.000968
• Publication Date: 2013-06-13T15:53:17Z
• Authors: Yoshiaki Nishijima; Yuta Adachi; Lorenzo Rosa; Saulius Juodkazis
• Keywords: Gas detector

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 (NDIR) absorption.The sensitivity SF 6 is increased around ∼27 times with metal hole array (MHA) microstructures placed on cell mirrors, as compared non-structured mirrors; an change 2% per 100 ppm obtained a standard commercial pyroelectric detector.Down-sizing IR-sensors to sub-1 mm width, delivering ∼ 40 nM (or 1 ppm) sensitivity, can be foreseen simple source-detector setup.