title: Plasmonic nickel nanoantennas.
abstract: The fundamental optical properties of pure nickel nanostructures are studied by far-field extinction spectroscopy and optical near-field microscopy, providing direct experimental evidence of the existence of particle plasmon resonances predicted by theory. Experimental and calculated near-field maps allow for unambiguous identification of dipolar plasmon modes. By comparing calculated near-field and far-field spectra, dramatic shifts are found between the near-field and far-field plasmon resonances, which are much stronger than in gold nanoantennas. Based on a simple damped harmonic oscillator model to describe plasmonic resonances, it is possible to explain these shifts as due to plasmon damping.
authors.affiliation: CIC nanoGUNE Consolider, 20018 Donostia-San Sebstián, Spain; Centro de Fisica de Materiales (CSIC-UPV/EHU) and Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Spain.
authors.forename: Jianing
authors.initials: J
authors.lastname: Chen
authors.forename: Pablo
authors.initials: P
authors.lastname: Albella
authors.forename: Zhaleh
authors.initials: Z
authors.lastname: Pirzadeh
authors.forename: Pablo
authors.initials: P
authors.lastname: Alonso-González
authors.forename: Florian
authors.initials: F
authors.lastname: Huth
authors.forename: Stefano
authors.initials: S
authors.lastname: Bonetti
authors.forename: Valentina
authors.initials: V
authors.lastname: Bonanni
authors.forename: Johan
authors.initials: J
authors.lastname: Åkerman
authors.forename: Josep
authors.initials: J
authors.lastname: Nogués
authors.forename: Paolo
authors.initials: P
authors.lastname: Vavassori
authors.forename: Alexandre
authors.initials: A
authors.lastname: Dmitriev
authors.forename: Javier
authors.initials: J
authors.lastname: Aizpurua
authors.forename: Rainer
authors.initials: R
authors.lastname: Hillenbrand