OREGON STATE UNIVERSITY

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

TitleOn-chip methane sensing by near-IR absorption signatures in a photonic crystal slot waveguide
Publication TypeJournal Article
Year of Publication2011
AuthorsLai, W-C., S. Chakravarty, A. X. Wang, C. Lin, and R. T. Chen
JournalOptics Letters
Volume36
Issue6
Pagination984
Date Published03/2011
ISSN1539-4794
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.

DOI10.1364/OL.36.000984
Short TitleOpt. Lett.