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Spatially resolved measurements of plasmonic eigenstates in complex-shaped, asymmetric nanoparticles: gold nanostars

Published online by Cambridge University Press:  13 June 2011

S. Mazzucco ,
O. Stéphan ,
C. Colliex ,
I. Pastoriza-Santos ,
L.M. Liz-Marzan ,
J. Garcia de Abajo  and
M. Kociak
S. Mazzucco
Affiliation:
Laboratoire de Physique des Solides, Bâtiment 510, CNRS/UMR 8502, Univ Paris Sud 11, 91405 Orsay, France
O. Stéphan
Affiliation:
Laboratoire de Physique des Solides, Bâtiment 510, CNRS/UMR 8502, Univ Paris Sud 11, 91405 Orsay, France
C. Colliex
Affiliation:
Laboratoire de Physique des Solides, Bâtiment 510, CNRS/UMR 8502, Univ Paris Sud 11, 91405 Orsay, France
I. Pastoriza-Santos
Affiliation:
Departamento de Química Física, and Unidad Asociada CSIC-Universidade de Vigo, 36310 Vigo, Spain
L.M. Liz-Marzan
Affiliation:
Departamento de Química Física, and Unidad Asociada CSIC-Universidade de Vigo, 36310 Vigo, Spain
J. Garcia de Abajo
Affiliation:
Instituto de Optica, CSIC, Serrano 121, 28006 Madrid, Spain
M. Kociak*
Affiliation:
Laboratoire de Physique des Solides, Bâtiment 510, CNRS/UMR 8502, Univ Paris Sud 11, 91405 Orsay, France
*
amathieu.kociak@u-psud.fr

Abstract

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We report on spatially resolved electron energy-loss spectroscopy studies of optical modes in individual star-shaped gold nanoparticles. We studied different morphologies, ranging from a spheroid to well-developed nanostars. For each shape, essentially two groups of modes are appearing: the first one is localized around the core of the nanostars and has an energy slightly less than the quasi-static dipolar mode of a gold sphere (about 2.2 eV); in the second group, the modes are localized at the end of the nanostar tips, with varying energies depending on the geometry of each tip and with energy down to 1.2 eV. The localization of the tip modes is interpreted with the help of boundary element methods simulations.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 54 , Issue 3: Focus on Recent advances in (S)TEM and related spectroscopies: a tribute to C. Colliex , June 2011 , 33512
Copyright
© EDP Sciences, 2011

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