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Ultrasensitive plasmonic sensing in air using optical fibre spectral combs

Author

Listed:
  • Christophe Caucheteur

    (University of Mons)

  • Tuan Guo

    (Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University)

  • Fu Liu

    (Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University)

  • Bai-Ou Guan

    (Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University)

  • Jacques Albert

    (Carleton University)

Abstract

Surface plasmon polaritons (SPP) can be excited on metal-coated optical fibres, enabling the accurate monitoring of refractive index changes. Configurations reported so far mainly operate in liquids but not in air because of a mismatch between permittivities of guided light modes and the surrounding medium. Here we demonstrate a plasmonic optical fibre platform that overcomes this limitation. The underpinning of our work is a grating architecture—a gold-coated highly tilted Bragg grating—that excites a spectral comb of narrowband-cladding modes with effective indices near 1.0 and below. Using conventional spectral interrogation, we measure shifts of the SPP-matched resonances in response to static atmospheric pressure changes. A dynamic experiment conducted using a laser lined-up with an SPP-matched resonance demonstrates the ability to detect an acoustic wave with a resolution of 10−8 refractive index unit (RIU). We believe that this configuration opens research directions for highly sensitive plasmonic sensing in gas.

Suggested Citation

  • Christophe Caucheteur & Tuan Guo & Fu Liu & Bai-Ou Guan & Jacques Albert, 2016. "Ultrasensitive plasmonic sensing in air using optical fibre spectral combs," Nature Communications, Nature, vol. 7(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13371
    DOI: 10.1038/ncomms13371
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    Cited by:

    1. Fu Liu & Wenqing Lu & Jiaqiang Huang & Vanessa Pimenta & Steven Boles & Rezan Demir-Cakan & Jean-Marie Tarascon, 2023. "Detangling electrolyte chemical dynamics in lithium sulfur batteries by operando monitoring with optical resonance combs," Nature Communications, Nature, vol. 14(1), pages 1-12, December.

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