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Parts-Per-Billion Carbon Monoxide Sensing in Silicon-on-Sapphire Mid-Infrared Photonic Crystal Waveguides

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Abstract

We experimentally detect 3 ppm carbon monoxide via optical absorbance in a 1mm long slotted photonic crystal waveguide in silicon-on-sapphire at wavelength λ= 4.55µm. Feasibility of low ppb sensing will be shown by design modifications.

© 2018 The Author(s)

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