III–V-on-silicon photonic integrated circuits for,spectroscopic sensing in the 2–4 µm wavelength range

Ruijun Wang, Anton Vasiliev, Muhammad Muneeb, Aditya Malik, Stephan Sprengel, Gerhard Boehm, Markus Christian Amann, Ieva Šimonytė, Augustinas Vizbaras, Kristijonas Vizbaras, Roel Baets, Gunther Roelkens

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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.

Original languageEnglish
Article number1788
JournalSensors (Switzerland)
Issue number8
StatePublished - 4 Aug 2017


  • Integrated spectrometer
  • Mid-infrared
  • Optical sensor
  • Silicon photonics
  • Spectroscopy


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