KIP publications

year 2010
author(s) F. Neubrech, A. Garcia-Etxarri, D. Weber, J. Bochterle, H. Shen, M. Lamy de la Chapelle, G. W. Bryant, J. Aizpurua and A. Pucci
title Defect-induced activation of symmetry forbidden infrared resonances in individual metallic nanorods
KIP-Nummer HD-KIP 10-14
KIP-Gruppe(n) F6
document type Paper
Keywords IR spectroscopy, nanoantennas, plasmonics
source Appl. Phys. Lett. 96 (2010) 213111
doi 10.1063/1.3437093
Abstract (en)

We report on the observation of second-order infrared (IR) plasmon resonances in lithographically
prepared gold nanorods investigated by means of far-field microscopic IR spectroscopy. In addition
to the fundamental antennalike mode, even and odd higher order resonances are observed under
normal incidence of light. The activation of even-order modes under normal incidence is surprising
since even orders are dipole-forbidden because of their centrosymmetric charge density oscillation.
Performing atomic force microscopy and calculations with the boundary element method, we
determine that excitation of even modes is enabled by symmetry breaking by structural deviations
of the rods from an ideal, straight shape.

  author   = {Neubrech, F. and Garcia-Etxarri, A. and Weber, D. and Bochterle, J. and Shen, H. and Lamy de la Chapelle, M. and Bryant, G. W. and Aizpurua, J. and Pucci, A.},
  title    = {Defect-induced activation of symmetry forbidden infrared resonances in individual metallic nanorods},
  journal  = {Appl. Phys. Lett.},
  year     = {2010},
  volume   = {96},
  number   = {21},
  pages    = {213111},
  doi      = {10.1063/1.3437093},
  url      = {}
URL Appl. Phys. Lett.
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