Journal
IEEE SENSORS JOURNAL
Volume 19, Issue 22, Pages 10425-10431Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2019.2931940
Keywords
Biochemical sensing; C-shaped fiber; Fabry-Perot interferometers; optical fiber sensing
Funding
- Ramsay Fellowship by the University of Adelaide
- Australian Research Council (ARC) Centre for Nanoscale BioPhotonics [CE14010003]
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A multiplexed fiber sensor is proposed based on Fabry-Perot interferometers formed by serially splicing C-shaped and single mode fibers. We first demonstrate multiplexed refractive index sensing by independently filling and measuring sodium chloride (NaCl) solutions with different concentrations in a two-cavity system. The results show minimal cross-talk between the two interferometers. The dual-cavity interferometric sensor was then applied to biochemical sensing by utilizing polyelectrolyte layer by layer self-assembly followed by the biotin-streptavidin binding mechanism. The proposed sensor solves an important problem in biochemical sensing by providing an ability to simultaneously measure a negative control, critical for reducing false positive measurements.
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