Journal
NATURE COMMUNICATIONS
Volume 7, Issue -, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/ncomms13371
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Funding
- Belgian F.R.S.-FNRS
- European Research Council [280161]
- ARC (Actions de la Recherche Concertee de la Federation Wallonie-Bruxelles) Prediction project
- Guangdong Youth Science and Technology Innovation Talents of China [2014TQ01X539]
- Guangdong Natural Science Foundation of China [2014A030313387]
- Guangdong Innovation Foundation of China [2015KTSCX016]
- Guangzhou Key Collaborative Innovation Foundation of China [201504290942056]
- Natural Sciences and Engineering Research Council of Canada [RGPIN 2014-05612]
- European Research Council (ERC) [280161] Funding Source: European Research Council (ERC)
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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.
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