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Plasmon spectroscopy and imaging of individual gold nanodecahedra: a combined optical microscopy, cathodoluminescence, and electron energy-loss spectroscopy study

Myroshnychenko, Viktor, Nelayah, Jaysen, Adamo, Giorgio, Geuquet, Nicolas, Rodríguez-Fernández, Jessica, Pastoriza-Santos, Isabel, MacDonald, Kevin F., Henrard, Luc, Liz-Marzán, Luis M., Zheludev, Nikolay I., Kociak, Mathieu and García de Abajo, F.Javier (2012) Plasmon spectroscopy and imaging of individual gold nanodecahedra: a combined optical microscopy, cathodoluminescence, and electron energy-loss spectroscopy study Nano Letters, 12, pp. 4172-4180. (doi:10.1021/nl301742h).

Record type: Article

Abstract

Imaging localized plasmon modes in noble metal nanoparticles is of fundamental importance for applications such as ultrasensitive molecular detection. Here, we demonstrate the combined use of optical dark-field microscopy (DFM), cathodoluminescence (CL), and electron energy-loss spectroscopy (EELS) to study localized surface plasmons on individual gold nanodecahedra. By exciting surface plasmons with either external light or an electron beam, we experimentally resolve a prominent dipole-active plasmon band in the far-field radiation acquired via DFM and CL, whereas EELS reveals an additional plasmon mode associated with a weak dipole moment. We present measured spectra and intensity maps of plasmon modes in individual nanodecahedra in excellent agreement with boundary-element method simulations, including the effect of the substrate. A simple tight-binding model is formulated to successfully explain the rich plasmon structure in these particles encompasing bright and dark modes, which we predict to be fully observable in less lossy silver decahedra. Our work provides useful insight into the complex nature of plasmon resonances in nanoparticles with pentagonal symmetry.

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Published date: 2012
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 342415
URI: http://eprints.soton.ac.uk/id/eprint/342415
ISSN: 1530-6984
PURE UUID: 174e1832-5770-4e79-9352-0f97c8f02620
ORCID for Kevin F. MacDonald: ORCID iD orcid.org/0000-0002-3877-2976

Catalogue record

Date deposited: 29 Aug 2012 11:25
Last modified: 04 Sep 2017 16:31

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Contributors

Author: Viktor Myroshnychenko
Author: Jaysen Nelayah
Author: Giorgio Adamo
Author: Nicolas Geuquet
Author: Jessica Rodríguez-Fernández
Author: Isabel Pastoriza-Santos
Author: Luc Henrard
Author: Luis M. Liz-Marzán
Author: Mathieu Kociak
Author: F.Javier García de Abajo

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