18 April 2016 Optical fiber meta-tips
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We report on the first example of a “meta-tip” configuration that integrates a metasurface on the tip of an optical fiber. Our proposed design is based on an inverted-Babinet plasmonic metasurface obtained by patterning (via focused ion beam) a thin gold film deposited on the tip of an optical fiber, so as to realize an array of rectangular aperture nanoantennas with spatially modulated sizes. By properly tuning the resonances of the aperture nanoantennas, abrupt variations can be impressed in the field wavefront and polarization. We fabricated and characterized several proof-of-principle prototypes operating an near-infrared wavelengths, and implementing the beam-steering (with various angles) of the cross-polarized component, as well as the excitation of surface waves. Our results pave the way to the integration of the exceptional field-manipulation capabilities enabled by metasurfaces with the versatility and ubiquity of fiber-optics technological platforms.
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Maria Principe, Maria Principe, Alberto Micco, Alberto Micco, Alessio Crescitelli, Alessio Crescitelli, Giuseppe Castaldi, Giuseppe Castaldi, Marco Consales, Marco Consales, Emanuela Esposito, Emanuela Esposito, Vera La Ferrara, Vera La Ferrara, Vincenzo Galdi, Vincenzo Galdi, Andrea Cusano, Andrea Cusano, } "Optical fiber meta-tips", Proc. SPIE 9883, Metamaterials X, 98831E (18 April 2016); doi: 10.1117/12.2227337; https://doi.org/10.1117/12.2227337

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