title: Tunability of subradiant dipolar and fano-type plasmon resonances in metallic ring/disk cavities: implications for nanoscale optical sensing.
abstract: Plasmonic nanocavities consisting of the concentric arrangement of a disk and a ring sustain both subradiant and superradiant dipolar plasmon modes with large associated field enhancements and high refractive index sensitivities. In structures with broken symmetry, additionally a highly tunable Fano interference feature appears, which can be explained with a simple analytical harmonic oscillator model. The spectral tunability of these resonances from the visible to the mid-infrared is investigated, highlighting a potential for applications in surface enhanced spectroscopies.
authors.affiliation: Laboratory for Nanophotonics, Department of Physics and Astronomy, Rice University, Houston, Texas 77005-1892, USA.
authors.forename: Feng
authors.initials: F
authors.lastname: Hao
authors.forename: Peter
authors.initials: P
authors.lastname: Nordlander
authors.forename: Yannick
authors.initials: Y
authors.lastname: Sonnefraud
authors.forename: Pol
authors.initials: P
authors.lastname: Van Dorpe
authors.forename: Stefan A
authors.initials: SA
authors.lastname: Maier