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 tip.For illustration and validation purposes,we present numer...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 tip.For 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 wavelengths.In particular,we demonstrate several examples of beam steering and coupling with surface waves,in fairly good agreement with theory.Our results constitute a first step toward the integration of unprecedented(metasurface-enabled)light-manipulation capabilities in optical-fiber technology.By 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.展开更多
This paper reports a simple and economical method for the fabrication of nanopatterned optical fiber nanotips.The proposed patterning approach relies on the use of the nanosphere lithography of the optical fiber end f...This paper reports a simple and economical method for the fabrication of nanopatterned optical fiber nanotips.The proposed patterning approach relies on the use of the nanosphere lithography of the optical fiber end facet.Polystyrene(PS)nanospheres are initially self-assembled in a hexagonal array on the surface of water.The 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 removal.Ordered 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 approach.Furthermore,the sizes and shapes of these periodic structures can be tailored by altering the fabrication conditions.The 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 cost.The method can be easily extended to simultaneously produce multiple fibers,opening a new route to the development of fiber-optic nanoprobes.Finally,we demonstrate the effective application of the patterned OFTs as surface-enhanced Raman spectroscopy nanoprobes.展开更多
文摘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 tip.For 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 wavelengths.In particular,we demonstrate several examples of beam steering and coupling with surface waves,in fairly good agreement with theory.Our results constitute a first step toward the integration of unprecedented(metasurface-enabled)light-manipulation capabilities in optical-fiber technology.By 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.
文摘This paper reports a simple and economical method for the fabrication of nanopatterned optical fiber nanotips.The proposed patterning approach relies on the use of the nanosphere lithography of the optical fiber end facet.Polystyrene(PS)nanospheres are initially self-assembled in a hexagonal array on the surface of water.The 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 removal.Ordered 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 approach.Furthermore,the sizes and shapes of these periodic structures can be tailored by altering the fabrication conditions.The 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 cost.The method can be easily extended to simultaneously produce multiple fibers,opening a new route to the development of fiber-optic nanoprobes.Finally,we demonstrate the effective application of the patterned OFTs as surface-enhanced Raman spectroscopy nanoprobes.
