Extraordinary evanescent field confinement waveguide sensor for mid-infrared trace gas spectroscopy

Marek Vlk; Anurup Datta; Sebastián Alberti; Henock Demessie Yallew; Vinita Mittal; Ganapathy Senthil Murugan; Jana Jágerská

doi:10.1038/s41377-021-00470-4

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Extraordinary evanescent field confinement waveguide sensor for mid-infrared trace gas spectroscopy

Letters

- Extraordinary evanescent field confinement waveguide sensor for mid-infrared trace gas spectroscopy
- Extraordinary evanescent field confinement waveguide sensor for mid-infrared trace gas spectroscopy
- LSA 2021年10卷第2期页码：147-153
- Affiliations：
  
  1.Department of Physics and Technology, UiT The Arctic University of Norway, NO-9037 Tromsø, Norway
  2.Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK
- Author bio：
  
  Ganapathy Senthil Murugan (smg@orc.soton.ac.uk)
  Jana Jágerská (jana.jagerska@uit.no)
- Funds：
- DOI：10.1038/s41377-021-00470-4
  中图分类号：
- 纸质出版日期：2021，
  
  网络出版日期：2021-01-29，
  
  收稿日期：2020-05-19，
  
  修回日期：2021-01-06，
  
  录用日期：2021-01-12
- Accepted：
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Extraordinary evanescent field confinement waveguide sensor for mid-infrared trace gas spectroscopy[J]. LSA, 2021,10(2):147-153.

Vlk, M. et al. Extraordinary evanescent field confinement waveguide sensor for mid-infrared trace gas spectroscopy. Light: Science & Applications, 10, 147-153 (2021).
Extraordinary evanescent field confinement waveguide sensor for mid-infrared trace gas spectroscopy[J]. LSA, 2021,10(2):147-153. DOI： 10.1038/s41377-021-00470-4.

Vlk, M. et al. Extraordinary evanescent field confinement waveguide sensor for mid-infrared trace gas spectroscopy. Light: Science & Applications, 10, 147-153 (2021). DOI： 10.1038/s41377-021-00470-4.

摘要

Abstract

Nanophotonic waveguides are at the core of a great variety of optical sensors. These structures confine light along defined paths on photonic chips and provide light-matter interaction via an evanescent field. However

waveguides still lag behind free-space optics for sensitivity-critical applications such as trace gas detection. Short optical pathlengths

low interaction strengths

and spurious etalon fringes in spectral transmission are among the main reasons why on-chip gas sensing is still in its infancy. In this work

we report on a mid-infrared integrated waveguide sensor that successfully addresses these drawbacks. This sensor operates with a 107% evanescent field confinement factor in air

which not only matches but also outperforms free-space beams in terms of the per-length optical interaction. Furthermore

negligible facet reflections result in a flat spectral background and record-low absorbance noise that can finally compete with free-space spectroscopy. The sensor performance was validated at 2.566 μm

which showed a 7 ppm detection limit for acetylene with only a 2 cm long waveguide.

关键词

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references

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