Modal interferometric refractive index sensing in microstructured exposed core fibres
Abstract
Optical fibre-based sensors measuring refractive index shift in bodily fluids and tissues are versatile and accurate probes of physiological processes. Here, we suggest a refractive index sensor based on a microstructured exposed-core fibre (ECF). By considering a high refractive index coating of the exposed core, our modelling demonstrates the splitting of the guided mode into a surface sensing mode and a mode that is isolated from the surface. With the isolated mode acting as a reference arm, this two-mode one-fibre solution provides for robust interferometric sensing with a sensitivity of up to 60,000 rad/RIU-cm, which is suitable for sensing subtle physiological processes within hard-to-reach places inside living organisms, such as the spinal cord, ovarian tract and blood vessels.
Cite
@article{arxiv.1909.03260,
title = {Modal interferometric refractive index sensing in microstructured exposed core fibres},
author = {Ivan S. Maksymov and Heike Ebendorff-Heidepriem and Andrew D. Greentree},
journal= {arXiv preprint arXiv:1909.03260},
year = {2020}
}