High-sensitivity label-free optical fiber optrodes based on the excitation of Bloch surface waves

M. Scaravilli; G. Castaldi; A. Cusano; V. Galdi

doi:10.1117/12.2236675

30 May 2016 High-sensitivity label-free optical fiber optrodes based on the excitation of Bloch surface waves

M. Scaravilli, G. Castaldi, A. Cusano, V. Galdi

Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 99161L (2016) https://doi.org/10.1117/12.2236675
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland

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.

Citation Download Citation

M. Scaravilli, G. Castaldi, A. Cusano, and V. Galdi "High-sensitivity label-free optical fiber optrodes based on the excitation of Bloch surface waves", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99161L (30 May 2016); https://doi.org/10.1117/12.2236675

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