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Nanosphere lithography for optical fiber tip nanoprobes

Light(Science & Applications) 2016年第1期5卷 173-184页

作者： Marco Pisco Francesco Galeotti Giuseppe Quero Giorgio Grisci Alberto Micco Lucia V Mercaldo Paola Delli Veneri antonello cutolo Andrea Cusano Optoelectronic Division-Engineering Department University of Sannio82100 BeneventoItaly National Research Council Institute for Macromolecular Studies(ISMAC-CNR)20133 MilanoItaly ENEA Portici Research Center80055 PorticiItaly

This paper reports a simple and economical method for the fabrication of nanopatterned optical fiber *** proposed patterning approach relies on the use of the nanosphere lithography of the optical fiber end ***(PS)nanospheres are initially self-assembled in a hexagonal array on the surface of *** created pattern is then transferred onto an optical fiber tip(OFT).The PS monolayer colloidal crystal on the OFT is the basic building block that is used to obtain different periodic structures by applying further treatment to the fiber,such as metal coating,nanosphere size reduction and sphere *** dielectric and metallo-dielectric sphere arrays,metallic nanoisland arrays and hole-patterned metallic films with feature sizes down to the submicron scale are achievable using this ***,the sizes and shapes of these periodic structures can be tailored by altering the fabrication *** results indicate that the proposed self-assembly approach is a valuable route for the development of highly repeatable metallo-dielectric periodic patterns on OFTs with a high degree of order and low fabrication *** method can be easily extended to simultaneously produce multiple fibers,opening a new route to the development of fiber-optic ***,we demonstrate the effective application of the patterned OFTs as surface-enhanced Raman spectroscopy nanoprobes.

关键词： lab-on-fiber nanosphere lithography SERS probes

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Optical fiber meta-tips

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Light(Science & Applications) 2016年第1期5卷 185-194页

作者： Maria Principe Marco Consales Alberto Micco Alessio Crescitelli Giuseppe Castaldi Emanuela Esposito Vera La Ferrara antonello cutolo Vincenzo Galdi Andrea Cusano Optoelectronic Division Department of EngineeringUniversity of SannioI-82100 BeneventoItaly Waves Group Department of EngineeringUniversity of SannioI-82100 BeneventoItaly Institute for Microelectronics and Microsystems National Research CouncilI-80131 NapoliItaly UTTP-MDB Materials and DevicesENEA-Portici Research CenterI-80055 PorticiNapoliItaly

We report on the first demonstration of a proof-of-principle optical fiber‘meta-tip’,which integrates a phase-gradient plasmonic metasurface on the fiber *** illustration and validation purposes,we present numerical and experimental results pertaining to various prototypes implementing generalized forms of the Snell’s transmission/reflection laws at near-infrared *** particular,we demonstrate several examples of beam steering and coupling with surface waves,in fairly good agreement with *** results constitute a first step toward the integration of unprecedented(metasurface-enabled)light-manipulation capabilities in optical-fiber *** further enriching the emergent‘lab-on-fiber’framework,this may pave the way for the widespread diffusion of optical metasurfaces in real-world applications to communications,signal processing,imaging and sensing.

关键词： Fiber optics metasurfaces plasmonics wavefront manipulation

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