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Proceedings Paper

High-sensitivity label-free optical fiber optrodes based on the excitation of Bloch surface waves
Author(s): M. Scaravilli; G. Castaldi; A. Cusano; V. Galdi
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Paper Abstract

In this study, the possibility to excite Bloch surface waves (BSWs) on the tip of a single-mode optical fiber is explored for the first time. In particular, we first show the possibility to achieve an on-tip excitation of BSWs, with optimized characteristic of the arising resonances, via an “all-fiber” grating-coupled configuration. Furthermore, envisioning novel high-performance fiber tip nanoprobes for label-free biosensing, we introduce an ad hoc design aimed at maximizing the refractive-index sensitivity. Numerical results indicate that the estimated sensitivities are comparable with those exhibited by current plasmonic lab-on-tip bio-probes, but are accompanied by a higher spectral selectivity. Therefore, this preliminary work paves the way to the development of new classes of miniaturized surface-wave optical fiber devices for low-detection-limit label-free chemical and biological sensing.

Paper Details

Date Published: 30 May 2016
PDF: 4 pages
Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99161L (30 May 2016); doi: 10.1117/12.2236675
Show Author Affiliations
M. Scaravilli, Univ. of Sannio (Italy)
G. Castaldi, Univ. of Sannio (Italy)
A. Cusano, Univ. of Sannio (Italy)
V. Galdi, Univ. of Sannio (Italy)

Published in SPIE Proceedings Vol. 9916:
Sixth European Workshop on Optical Fibre Sensors
Elfed Lewis, Editor(s)

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