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27 April 2016 Visible vs near-infrared optical fiber plasmonics: performance comparison for protein sensing
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In this work, two plasmonic optical fiber sensor configurations are used for protein sensing and their relative performances in terms of limit of detection and sensitivity are compared. The first configuration consists in unclad 200 μm optical fibers that produce a broadband resonance in the visible wavelength range around 650 nm while the second configuration makes use of multiple narrowband resonances produced in the C+L bands with weakly tilted fiber Bragg gratings photo-inscribed in telecommunication-grade single-mode optical fibers. In both cases, the sensitive regions are surrounded by a ~50 nm gold layer so that the evanescent wave can excite a surface plasmon polariton at the metalsurrounding medium interface. Both configurations are used to sense green fluorescent proteins. Our experimental results demonstrate that the two sensor configurations present a complementary measurement dynamics as a function of the investigated concentration in the range 10-12 – 10-7 g/ml. We attribute this difference of sensitivity to the difference of penetration depth of the evanescent wave in the surrounding medium, which is proportional to the light wavelength.
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Christophe Caucheteur, Clotilde Ribaut, and Ruddy Wattiez "Visible vs near-infrared optical fiber plasmonics: performance comparison for protein sensing", Proc. SPIE 9887, Biophotonics: Photonic Solutions for Better Health Care V, 98872A (27 April 2016);

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