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Plasmonic Nickel Nanoantennas

Journal article
Authors Jianing Chen
Pablo Albella
Zhaleh Pirzadeh
Pablo Alonso-Gonzalez
Florian Huth
Stefano Bonetti
Valentina Bonanni
Johan Åkerman
Josep Nogues
Paolo Vavassori
Alexandre Dmitriev
Javier Aizpurua
Rainer Hillenbrand
Published in Small
Volume 7
Issue 16
Pages 2341–2347
ISSN 1613-6829
Publication year 2011
Published at Department of Physics (GU)
Pages 2341–2347
Language en
Links dx.doi.org/10.1002/smll.201100640
Subject categories Optics, Optical physics, Functional materials, Engineering physics

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-fi eld 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.

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