Sensitive on-chip methane detection with a cryptophane-A cladded Mach-Zehnder interferometer
AuthorDullo, Firehun Tsige; Lindecrantz, Susan; Jagerska, Jana; Hansen, Jørn H; Engqvist, Stig Olov Magnus; Solbø, Stian; Hellesø, Olav Gaute
We report a methane sensor based on an integrated Mach-Zehnder interferometer, which is cladded by a styrene-acrylonitrile film incorporating cryptophane-A. Cryptophane-A is a supramolecular compound able to selectively trap methane, and its presence in the cladding leads to a 17-fold sensitivity enhancement. Our approach, based on 3 cm-long low-loss Si3N4 rib waveguides, results in a detection limit as low as 17 ppm. This is 1–2 orders of magnitude lower than typically achieved with chip-scale low-cost sensors.
Published version. Source at http://dx.doi.org/10.1364/OE.23.031564.
PublisherOptical Society of America
CitationOptics Express 2015
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