Sensitive on-chip methane detection with a cryptophane-A cladded Mach-Zehnder interferometer

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 en...

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Bibliographic Details
Published in:Optics express 2015-11, Vol.23 (24), p.31564-31573
Main Authors: Dullo, Firehun Tsige, Lindecrantz, Susan, Jágerská, Jana, Hansen, Jørn H, Engqvist, Magnus, Solbø, Stian Andre, Hellesø, Olav Gaute
Format: Article
Language:English
Subjects:
Integrated optics devices
Sensors
Teknologi: 500
VDP
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Summary: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 Si N 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.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.23.031564