Carbon dioxide absorption spectroscopy with a mid-infrared silicon photonic waveguide

  title={Carbon dioxide absorption spectroscopy with a mid-infrared silicon photonic waveguide},
  author={Floria Ottonello-Briano and Carlos Errando-Herranz and Henrik R{\"o}djeg{\aa}rd and Hans Martin and Hans Sohlstr{\"o}m and Kristinn B. Gylfason},
  journal={arXiv: Applied Physics},
Carbon dioxide is a vital gas for life on Earth, a waste product of human activities, and widely used in agriculture and industry. Its accurate sensing is therefore of great interest. Optical sensors exploiting the mid-infrared light absorption of CO$_{\mathrm{2}}$ provide high selectivity, but their large size and high cost limit their use. Here, we demonstrate CO$_{\mathrm{2}}$ gas sensing at 4.2 $\mu$m wavelength using an integrated silicon waveguide, featuring a sensitivity to CO$_{\mathrm… 

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