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Proceedings Paper

Ultra-compact remote CO2 detection with silicon waveguide ring resonators (Conference Presentation)
Author(s): Ross Cheriton; Suresh Sivanandam; Adam Densmore; Daniele Melati; Mohsen Kamandar Dezfouli; Danxia Xu; Jens Schmidt; Jean Lapointe; Luc Simard; Pavel Cheben; Siegfried Janz

Paper Abstract

Astronomical instrumentation is traditionally costly, large, and alignment-sensitive owing to the use of bulk optics. The use of integrated photonic devices in astronomical instrumentation can mitigate such drawbacks in certain applications where high light throughput and spectral bandwidth are less crucial. In this work, we present an ultra-compact carbon dioxide detection scheme using a single silicon waveguide ring resonator. The comb-like absorption line spectrum of CO2 around 1580 nm wavelength can closely match the comb spectrum of an appropriately designed ring resonator. By actively correlating such a ring spectrum with the CO2 absorption lines, a specific detection signal can be generated. We design the free spectral range of a ring resonator to match the absorption line spacing of carbon dioxide lines in the range from 1575 to 1585 nm. Using thermo-optic modulation, the ring resonator drop or through port transmission spectrum can be shifted back and forth across the incoming CO2 light spectrum, resulting in a modulated signal with an amplitude proportional to the CO2 absorption line strength. Furthermore, high frequency modulation and lock-in detection can result in a significant improvement in the signal to noise ratio. We demonstrate that such a device can provide real-time carbon dioxide detection for applications in ground- and satellite-based astronomy, as well as remote atmospheric sensing, in a compact package. In future work, such a sensor can be adapted to a range of gases and used to determine radial velocities and compositional maps of astronomical objects.

Paper Details

Date Published: 12 September 2019
Proc. SPIE 11129, Infrared Sensors, Devices, and Applications IX, 111290K (12 September 2019); doi: 10.1117/12.2529367
Show Author Affiliations
Ross Cheriton, National Research Council Canada (Canada)
Suresh Sivanandam, Univ. of Toronto (Canada)
Adam Densmore, National Research Council Canada (Canada)
Daniele Melati, National Research Council Canada (Canada)
Mohsen Kamandar Dezfouli, National Research Council Canada (Canada)
Danxia Xu, National Research Council Canada (Canada)
Jens Schmidt, National Research Council Canada (Canada)
Jean Lapointe, National Research Council Canada (Canada)
Luc Simard, National Research Council Canada (Canada)
Pavel Cheben, National Research Council Canada (Canada)
Siegfried Janz, National Research Council Canada (Canada)

Published in SPIE Proceedings Vol. 11129:
Infrared Sensors, Devices, and Applications IX
Paul D. LeVan; Priyalal Wijewarnasuriya; Ashok K. Sood, Editor(s)

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