title: Sensitive on-chip methane detection with a cryptophane-A cladded Mach-Zehnder interferometer.
abstract: 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 Si3N4rib 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.
authors.forename: Firehun Tsige
authors.initials: FT
authors.lastname: Dullo
authors.forename: Susan
authors.initials: S
authors.lastname: Lindecrantz
authors.forename: Jana
authors.initials: J
authors.lastname: Jágerská
authors.forename: Jørn H
authors.initials: JH
authors.lastname: Hansen
authors.forename: Magnus
authors.initials: M
authors.lastname: Engqvist
authors.forename: Stian Andre
authors.initials: SA
authors.lastname: Solbø
authors.forename: Olav Gaute
authors.initials: OG
authors.lastname: Hellesø