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Search: WFRF:(Sohlström Hans 1952 ) > (2020)

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1.
  • Gylfason, Kristinn, 1978-, et al. (author)
  • On-chip spectroscopy of CO2 with MIR waveguides
  • 2020
  • In: Optics InfoBase Conference Papers. - : The Optical Society.
  • Conference paper (peer-reviewed)abstract
    • We review our recent work on spectroscopic sensing of carbon dioxide in the mid-infrarded region around 4.3 µm using suspended silicon waveguides. Our waveguides are built on standard silicon-on-insulator substrates and acheive high sensitivity to gas. 
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2.
  • Ottonello Briano, Floria, et al. (author)
  • Carbon dioxide absorption spectroscopy with a mid-infrared silicon photonic waveguide
  • 2020
  • In: Optics Letters. - : OSA - The Optical Society. - 0146-9592 .- 1539-4794. ; 45:1, s. 109-112
  • Journal article (peer-reviewed)abstract
    • Carbon dioxide (CO2) is a gas vital for life on Earth. It is also a waste product of human activities and is widely used in agriculture and industry. Its accurate sensing is therefore of great interest. Optical sensors exploiting the mid-infrared light absorption of CO2 provide high selectivity, but their large size and high cost limit their use. In this Letter, we demonstrate CO2 gas sensingat 4.2 μm wavelength using an integrated silicon waveguide, featuring a sensitivity to CO2of 44% that of free-space sensing. The suspended waveguide is fabricated on a silicon-on-insulator substrate by a single-lithography-step process, and we route it into a mid-infrared photonic circuit for on-chip-referenced gas measurements. Its demonstrated performance and its simple and scalable fabrication make our waveguide ideal for integration in miniaturized CO2 sensors for distributed environmental monitoring, personal safety, and medical and high-volume consumer applications. © 2019 Optical Society of America.
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