title: Broadband metacoaxial nanoantenna for metasurface and sensing applications.
abstract: We introduce a metacoaxial nanoantenna (MN) that super-localizes the incident electromagnetic field to "hotspots" with a top-down area of 2 nm(2), a local field enhancement of ~200-400, and a field localization with a very large spectral range from the visible to the infrared range that has a spectral bandwidth ≥ 900 nm. Not only is this nanoantenna extremely broadband with ultra-high localization, it also shows significant improvements over traditional nanoantenna designs, as the hotspots are re-configurable by breaking the circular symmetry which enables the ability to tailor the polarization response. These attributes offer significant improvements over traditional nanoantennas as building blocks for metasurfaces and enhanced biodetection that we demonstrate in this work.
authors.forename: Alexei
authors.initials: A
authors.lastname: Smolyaninov
authors.forename: Lin
authors.initials: L
authors.lastname: Pang
authors.forename: Lindsay
authors.initials: L
authors.lastname: Freeman
authors.forename: Maxim
authors.initials: M
authors.lastname: Abashin
authors.forename: Yeshaiahu
authors.initials: Y
authors.lastname: Fainman
mesh_terms: D004867:Equipment Design; D053768:Metal Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*