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Proceedings Paper

Photonic crystal slot waveguide spectrometer for the detection of methane
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Paper Abstract

Defect engineered photonic crystals, with sub-micron dimensions have demonstrated high sensitivity to trace volumes of analytes; however exact identification of analyte through spectroscopic signatures had not been demonstrated. We demonstrate a 300micron long photonic crystal slot waveguide device which combines slow light phenomenon in photonic crystal waveguides with large optical field intensity in a low index narrow slot at the center of the photonic crystal waveguide for highly sensitive spectroscopic detection of methane on-chip at 100 parts per million (ppm) or 0.2% permissible exposure limit. Photonic crystal slot waveguide provides a factor of 1000 reduction in interaction length compared to free-space infrared spectroscopy leading to enhanced optical absorption by analytes in the optical path. By measuring absorption differences in presence and absence of methane, near-infrared absorption spectrum of methane is determined.

Paper Details

Date Published: 17 January 2011
PDF: 7 pages
Proc. SPIE 7941, Integrated Optics: Devices, Materials, and Technologies XV, 79410K (17 January 2011); doi: 10.1117/12.873299
Show Author Affiliations
Swapnajit Chakravarty, Omega Optics, Inc. (United States)
Wei-Cheng Lai, The Univ. of Texas at Austin (United States)
Xiaolong Wang, Omega Optics, Inc. (United States)
Cheyun Lin, The Univ. of Texas at Austin (United States)
Ray T. Chen, The Univ. of Texas at Austin (United States)

Published in SPIE Proceedings Vol. 7941:
Integrated Optics: Devices, Materials, and Technologies XV
Jean Emmanuel Broquin; Gualtiero Nunzi Conti, Editor(s)

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