Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 17, Issue 5, Pages 1129-1133Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/17/5/S32
Keywords
fibre optic sensors; refractive index sensor; coreless silica fibre; multimode interference; evanescent wave; chemical sensor; biosensor
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We experimentally demonstrate a new compact surrounding refractive-index sensor using a MMF-CSF-MMF (MCM) structure. The evanescent waves in the coreless silica fibre (CSF) region can directly interact with the surrounding medium. Due to its distinctive resonant spectral feature, the MCM sensor showed a high sensitivity of 4.37 x 10(-4) for a refractive index range of 1.30 to 1.44, suggesting that the proposed device may be suitable for a wide range of biomedical and chemical sensor applications.
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