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Proceedings Paper

Photonic crystal slot waveguide for high sensitivity on-chip near-infrared optical absorption spectroscopy of xylene in water
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Paper Abstract

We experimentally demonstrate a 300μm long silicon photonic crystal slot waveguide for on-chip near-infrared absorption spectroscopy. Based on the Beer-Lambert absorption law, our device combines slow light in photonic crystal waveguide with high electric field intensity in low-index 75nm wide slot, which effectively increases the optical absorption path length of the analyte. We demonstrate near-infrared absorption spectroscopy of xylene in water, independent of near-infrared absorption signatures of water, with a hydrophobic PDMS sensing phase that extracts xylene from water. Xylene concentrations up to 100ppb (parts per billion) (86μg/L) in water were measured.

Paper Details

Date Published: 12 May 2011
PDF: 7 pages
Proc. SPIE 8032, Next-Generation Spectroscopic Technologies IV, 80320N (12 May 2011); doi: 10.1117/12.883660
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)
Che-Yun 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. 8032:
Next-Generation Spectroscopic Technologies IV
Mark A. Druy; Richard A. Crocombe, Editor(s)

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