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Proceedings Paper

Sapphire fiber optic-based surface-enhanced Raman scattering by direct and evanescent-field excitation
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Paper Abstract

We present a study on surface-enhanced Raman scattering (SERS) utilizing unclad single crystal sapphire fiber with Ag nanoparticles (NPs) immobilized either at the fiber distal end for direct excitation or on the fiber surface for evanescent-field interaction. The dependence of SERS intensity on the coverage density of Ag NPs was investigated. We demonstrated robust SERS sensitivity in both cases. For direct excitation-based sensing, we found that a sensitivity maximum exists with increased particle coverage beyond which the sensitivity starts to decline. More importantly though, for evanescent-field based measurements, we revealed that multimode sapphire fiber can accommodate Ag NPs at a far higher particle coverage density than single-mode fiber while maintaining the dominance of SERS gain despite competitive absorption and scattering loss by Ag NPs with a limit of detection of 10-9 M Rhodamine 6G solution.

Paper Details

Date Published: 18 June 2014
PDF: 5 pages
Proc. SPIE 9098, Fiber Optic Sensors and Applications XI, 90980T (18 June 2014); doi: 10.1117/12.2053433
Show Author Affiliations
Hui Chen, Stevens Institute of Technology (United States)
Fei Tian, Stevens Institute of Technology (United States)
Jingmao Chi, Stevens Institute of Technology (United States)
Henry Du, Stevens Institute of Technology (United States)

Published in SPIE Proceedings Vol. 9098:
Fiber Optic Sensors and Applications XI
Henry H. Du; Gary Pickrell; Eric Udd; Christopher S. Baldwin; Jerry J. Benterou; Anbo Wang, Editor(s)

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