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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 …
International Society for Optics and Photonics
Publication date: 
30 May 2016

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

Biblio References: 
Volume: 9916 Pages: 99161V
Sixth European Workshop on Optical Fibre Sensors