期刊
LIGHT-SCIENCE & APPLICATIONS
卷 10, 期 1, 页码 -出版社
SPRINGERNATURE
DOI: 10.1038/s41377-021-00470-4
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资金
- European Research Council [758973]
- Research Council of Norway [262608]
- TromsO Research Foundation [17_SG_JJ]
- Norwegian PhD Network on Nanotechnology for Microsystems [221860/F60]
- EPSRC SPFS Programme grant [EP/L00044X/1]
- The Future Photonics Hub (EPSRC) [EP/N00762X/1]
- European Research Council (ERC) [758973] Funding Source: European Research Council (ERC)
- EPSRC [EP/L00044X/1] Funding Source: UKRI
This study presents a mid-infrared integrated waveguide sensor that addresses some drawbacks of waveguide sensing in air, performing well in terms of optical interaction per unit length and achieving a detection limit of 7 ppm for acetylene.
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 mu m, which showed a 7 ppm detection limit for acetylene with only a 2 cm long waveguide.
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