title: Nanophotonics. Plasmon quantum limit exposed.
abstract: Confinement of light in subnanometre gaps encounters a fundamental limit in the quantum tunnelling regime.
authors.affiliation: Institut de Ciencies Fotoniques, Mediterranean Technology Park, Castelldefels, Barcelona, Spain. Niek.vanHulst@ICFO.eu
authors.forename: Niek F
authors.initials: NF
authors.lastname: van Hulst