title: The ring: a leitmotif in plasmonics.
abstract: An interesting paper in this issue describes an experiment that is an optical analogue of the "quantum corral" on metal surfaces constructed and observed using scanning tunneling microscopy more than a decade ago. In this Perspective, the mechanism underlying the confinement and manipulation of light in metallic nanorings and related structures are discussed, with an emphasis on recent results.
authors.affiliation: Laboratory for Nanophotonics, Department of Physics and Astronomy, Rice University, Houston, Texas 77005-1892, USA. nordland@rice.edu
authors.forename: Peter
authors.initials: P
authors.lastname: Nordlander