Sensitivity improvements of exposed-core microstructured optical fibre Bragg grating refractive index sensors

S. C. Warren-Smith; T. M. Monro

doi:10.1117/12.2059161

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2 June 2014 Sensitivity improvements of exposed-core microstructured optical fibre Bragg grating refractive index sensors

S. C. Warren-Smith, T. M. Monro

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Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91577S (2014) https://doi.org/10.1117/12.2059161
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

Abstract

Femtosecond laser written Bragg gratings have been written in various exposed-core microstructured optical fibres (ECMOFs) for the first time. The EC-MOFs have different core diameters ranging from 2.7 μm to 12.5 μm and offer different degrees of core access depending on application requirements. Writing a Bragg grating on an open core fibre allows for refractive index based sensing, with a view to multiplexed biosensing. Smaller core fibres are shown both experimentally and theoretically to provide a higher sensitivity, with experimental sensitivities demonstrated up to 6.4 nm/RIU over the refractive index range from 1.333 (water) to 1.377 (isopropanol).

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S. C. Warren-Smith and T. M. Monro "Sensitivity improvements of exposed-core microstructured optical fibre Bragg grating refractive index sensors", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91577S (2 June 2014); https://doi.org/10.1117/12.2059161

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