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Sensors 2018, 18(9), 2870;

Feasibility of Telecom-Wavelength Photonic Integrated Circuits for Gas Sensors

Department of Engineering, Aarhus University, Finlandsgade 22, 8200 Aarhus, Denmark
Author to whom correspondence should be addressed.
Received: 24 July 2018 / Revised: 16 August 2018 / Accepted: 26 August 2018 / Published: 31 August 2018
(This article belongs to the Section Chemical Sensors)
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To be of commercial interest, gas sensors must optimise, among others, sensitivity, selectivity, longevity, cost and measurement speed. Using the example of ammonia, we establish that integrated optical sensors provide means to maintain the benefits of optical detection set-ups at, in principle, a lower cost and smaller footprint than currently available commercial products. Photonic integrated circuits (PICs) can be used in environmental and agricultural monitoring. The small footprint and great cost scaling of PICs allow for sensor networks with multiple devices. We show, that Indium Phosphide based commercial foundries reached the technological maturity to enable ammonia detection levels at less than 100 ppb. The current unavailability of portable, low cost ammonia sensors with such detection levels prevents emission monitoring, for example, in pig farms. The feasibility of these sensors is investigated by applying the common noise figures of the multiproject wafer platforms operating around 1550 nm to a model for an absorption measurement. The analysis is extended to other relevant gas species with absorption features near telecom-wavelengths. View Full-Text
Keywords: photonic integrated circuit; tunable laser; gas spectroscopy; indium phosphide; ammonia photonic integrated circuit; tunable laser; gas spectroscopy; indium phosphide; ammonia

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Hänsel, A.; Heck, M.J.R. Feasibility of Telecom-Wavelength Photonic Integrated Circuits for Gas Sensors. Sensors 2018, 18, 2870.

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