Journal
OPTICS LETTERS
Volume 36, Issue 6, Pages 984-986Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.36.000984
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Funding
- Environmental Protection Agency [EP-D-10-047]
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We demonstrate a 300 mu m 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 increases the optical absorption path length. A methane concentration of 100 ppm (parts per million) in nitrogen was measured. (C) 2011 Optical Society of America
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