Meta-tips for lab-on-fiber optrodes

M. Principe; M. Consales; A. Micco; A. Crescitelli; G. Castaldi; E. Esposito; V. La Ferrara; A. Cutolo; V. Galdi; A. Cusano

doi:10.1117/12.2236316

30 May 2016 Meta-tips for lab-on-fiber optrodes

M. Principe, M. Consales, A. Micco, A. Crescitelli, G. Castaldi, E. Esposito, V. La Ferrara, A. Cutolo, V. Galdi, A. Cusano

Author Affiliations +

Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 99161V (2016) https://doi.org/10.1117/12.2236316
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland

Abstract

We realize the first optical-fiber “meta-tip” that integrates a metasurface on the tip of an optical fiber. In our proposed configuration a Babinet-inverted plasmonic metasurface is fabricated by patterning (via focused-ion-beam) an array of rectangular aperture nanoantennas in a thin gold film. Via spatial modulation of the nanoantennas size, we properly tune their resonances so as to impress abrupt arbitrary phase variations in the transmitted field wavefront. As a proof-of-principle, we fabricate and characterize several prototypes implementing in the near-infrared the beam-steering with various angles. We also explore the limit case where surface waves are excited, and its capability to work as refractive index sensors. Notably, its sensitivity overwhelms that of the corresponding gradient-free plasmonic array, thus paving the way to the use of metasurfaces for label-free chemical and biological sensing. Our experimental results, in fairly good agreement with numerical predictions, demonstrate the practical feasibility of the meta-tip concept, and set the stage for the integration of metasurfaces, and their exceptional capabilities to manipulate light, in fiber-optics technological platforms, within the emerging “lab-on-fiber” paradigm.

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M. Principe, M. Consales, A. Micco, A. Crescitelli, G. Castaldi, E. Esposito, V. La Ferrara, A. Cutolo, V. Galdi, and A. Cusano "Meta-tips for lab-on-fiber optrodes", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99161V (30 May 2016); https://doi.org/10.1117/12.2236316

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