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Optics Letters

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  • Vol. 36, Iss. 6 — Mar. 15, 2011
  • pp: 984–986

On-chip methane sensing by near-IR absorption signatures in a photonic crystal slot waveguide

Wei-Cheng Lai, Swapnajit Chakravarty, Xiaolong Wang, Cheyun Lin, and Ray T. Chen  »View Author Affiliations


Optics Letters, Vol. 36, Issue 6, pp. 984-986 (2011)
http://dx.doi.org/10.1364/OL.36.000984


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Abstract

We demonstrate a 300 μm long silicon photonic crystal (PC) slot waveguide device for on-chip near-infrared absorption spectroscopy, based on the Beer–Lambert law for the detection of methane gas. The device combines slow light in a PC waveguide with high electric field intensity in a low-index 90 nm wide slot, which effectively in creases the optical absorption path length. A methane concentration of 100 ppm (parts per million) in nitrogen was measured.

© 2011 Optical Society of America

OCIS Codes
(300.6340) Spectroscopy : Spectroscopy, infrared
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(230.5298) Optical devices : Photonic crystals

ToC Category:
Spectroscopy

History
Original Manuscript: December 21, 2010
Revised Manuscript: February 12, 2011
Manuscript Accepted: February 17, 2011
Published: March 14, 2011

Virtual Issues
Vol. 6, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Wei-Cheng Lai, Swapnajit Chakravarty, Xiaolong Wang, Cheyun Lin, and Ray T. Chen, "On-chip methane sensing by near-IR absorption signatures in a photonic crystal slot waveguide," Opt. Lett. 36, 984-986 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-6-984


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