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Title: Ultra-fast polymer optical fibre Bragg grating inscription for medical devices
Authors: Bonefacino, J 
Tam, HY 
Glen, TS 
Cheng, X 
Pun, CFJ 
Wang, J 
Lee, PH 
Tse, MLV 
Boles, ST 
Issue Date: 2018
Source: Light : science & applications, 23 Mar. 2018, v. 7, 17161, p. 1-10
Abstract: We report the extraordinary result of rapid fibre Bragg grating inscription in doped polymer optical fibres based on polymethyl methacrylate in only 7 ms, which is two orders of magnitude faster than the inscription times previously reported. This was achieved using a new dopant material, diphenyl disulphide, which was found to enable a fast, positive refractive index change using a low ultraviolet dose. These changes were investigated and found to arise from photodissociation of the diphenyl disulphide molecule and subsequent molecular reorganization. We demonstrate that gratings inscribed in these fibres can exhibit at least a 15 times higher sensitivity than silica glass fibre, despite their quick inscription times. As a demonstration of the sensitivity, we selected a highly stringent situation, namely, the monitoring of a human heartbeat and respiratory functions. These findings could permit the inscription of fibre Bragg gratings during the fibre drawing process for mass production, allowing costeffective, single-use, in vivo sensors among other potential uses.
Keywords: Bio-sensing
Fibre Bragg grating
Photosensitive dopant
Polymer optical fibre
Publisher: Springer Nature
Journal: Light : science & applications 
EISSN: 2047-7538
DOI: 10.1038/lsa.2017.161
Rights: This work is licensed under a Creative Commons Attribution 4.0International License. The images or other third party material in thisarticle are included in the article’s Creative Commons license, unless indicated otherwisein the credit line; if the material is not included under the Creative Commons license, userswill need to obtain permission from the license holder to reproduce the material. To view acopy of this license, visit http://creativecommons.org/licenses/by/4.0/
© The Author(s) 2018
The following publication Bonefacino, J., Tam, H. Y., Glen, T. S., Cheng, X., Pun, C. F. J., Wang, J., … & Boles, S. T. (2018). Ultra-fast polymer optical fibre Bragg grating inscription for medical devices. Light : Science & Applications, 7, 17161, 1-10 is available at https://dx.doi.org/10.1038/lsa.2017.161
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