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.
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