Ultra-fast polymer optical fibre Bragg grating inscription for medical devices
| Autor: | Ming Leung Vincent Tse, Julien Bonefacino, Steven T. Boles, Chi-Fung Jeff Pun, Tom S. Glen, Hwa Yaw Tam, Po Heng Lee, Xin Cheng, Jian Wang |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Optical fiber
Materials science Fabrication fibre Bragg grating 02 engineering and technology medicine.disease_cause 01 natural sciences Article law.invention 010309 optics bio-sensing Fiber Bragg grating law 0103 physical sciences medicine Ultraviolet light Dopant business.industry 021001 nanoscience & nanotechnology Laser Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials polymer optical fibre Optoelectronics photosensitive dopant 0210 nano-technology business Refractive index Ultraviolet |
| Zdroj: | Light, Science & Applications |
| ISSN: | 2047-7538 2095-5545 |
| Popis: | 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 cost-effective, single-use, in vivo sensors among other potential uses. Bragg gratings have been written into polymer optical fibres in a few milliseconds, thanks to the use of a new dopant in the fibres’ cores. Fibre Bragg gratings can be quickly inscribed in silica optical fibres, but it takes much longer to inscribe gratings in polymethyl methacrylate (PMMA) fibres. Julien Bonefacino and co-workers from the Hong Kong Polytechnic University solved this problem by adding diphenyl disulphide to both raise the refractive index of the fibres’ cores and make them highly photosensitive. Using low-fluence ultraviolet light from a helium–cadmium laser, Bragg gratings could be inscribed in only 7 milliseconds—about 140 times faster than previously reported inscription times and short enough to make the scheme potentially compatible with fabrication during fibre drawing. The gratings are promising for use in sensing applications, such as measuring heartbeat and respiration. |
| Databáze: | OpenAIRE |
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