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Sensors 2017, 17(8), 1788;

III–V-on-Silicon Photonic Integrated Circuits for Spectroscopic Sensing in the 2–4 μm Wavelength Range

Photonics Research Group, Ghent University-imec, Technologiepark-Zwijnaarde 15, Ghent 9052, Belgium
Center for Nano- and Biophotonics (NB-Photonics), Ghent University, Ghent 9000, Belgium
Walter Schottky Institut, Technische Universität München, Am Coulombwall 4, Garching 85748, Germany
Brolis Semiconductors UAB, Moletu pl. 73, Vilnius LT-14259, Lithuania
These authors contributed equally to this work.
Current Address: Department of Electrical and Computer Engineering, University of California Santa Barbara, Santa Barbara, CA 93106, USA.
Author to whom correspondence should be addressed.
Received: 7 July 2017 / Revised: 29 July 2017 / Accepted: 31 July 2017 / Published: 4 August 2017
(This article belongs to the Special Issue Silicon Technologies for Photonic Sensors)
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The availability of silicon photonic integrated circuits (ICs) in the 2–4 μm wavelength range enables miniature optical sensors for trace gas and bio-molecule detection. In this paper, we review our recent work on III–V-on-silicon waveguide circuits for spectroscopic sensing in this wavelength range. We first present results on the heterogeneous integration of 2.3 μm wavelength III–V laser sources and photodetectors on silicon photonic ICs for fully integrated optical sensors. Then a compact 2 μm wavelength widely tunable external cavity laser using a silicon photonic IC for the wavelength selective feedback is shown. High-performance silicon arrayed waveguide grating spectrometers are also presented. Further we show an on-chip photothermal transducer using a suspended silicon-on-insulator microring resonator used for mid-infrared photothermal spectroscopy. View Full-Text
Keywords: silicon photonics; mid-infrared; optical sensor; integrated spectrometer; spectroscopy silicon photonics; mid-infrared; optical sensor; integrated spectrometer; spectroscopy

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Wang, R.; Vasiliev, A.; Muneeb, M.; Malik, A.; Sprengel, S.; Boehm, G.; Amann, M.-C.; Šimonytė, I.; Vizbaras, A.; Vizbaras, K.; Baets, R.; Roelkens, G. III–V-on-Silicon Photonic Integrated Circuits for Spectroscopic Sensing in the 2–4 μm Wavelength Range. Sensors 2017, 17, 1788.

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