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Electron energy loss spectroscopy and cathodoluminescence as powerful tools for studying surface-plasmon modes in metal nanostructures

Electron energy loss spectroscopy and cathodoluminescence as powerful tools for studying surface-plasmon modes in metal nanostructures
Electron energy loss spectroscopy and cathodoluminescence as powerful tools for studying surface-plasmon modes in metal nanostructures
Metallic nanoparticles can interact strongly with external sources such as light or electron beam due to resonant excitation of surface plasmon modes which leads to strong electric field enhancements, particularly near edges and in gaps between metallic parts. The geometrical sensitivity of plasmon resonance allows one to play with size and shape of the particles in order to tune plasmon resonances to wavelengths of interest. This has given rise to an active research in finding new techniques for controlling size and shape of metallic nanoparticles.
The study of the near field associated with particle plasmons by optical means is limited by the low resolution. In contrast, the methods that are based on interaction of fast electrons with nanostructures allow one getting local information on plasmons with nanometer resolution. In particular, electron energy loss spectroscopy (EELS) and cathodoluminescence (CL) provide powerful tools for studying plasmons in metal nanostructures. The maxima in the energy loss spectra of transmitted electrons and maxima in the emission of light reflect the energies of the particle-plasmon excitations to which they couple.
In the present work we provide the experimental and theoretical analysis of energy loss suffered by fast electrons passing through or near system of metallic nanoparticles of different shapes as well as the resulting CL emission spectra. The theoretical results are calculated using the boundary element method based upon rigorous solution of Maxwell's equations. Plasmon modes in the metallic nanoparticles are observed. The dependence of the loss and emission spectra on a particle morphology is explored. We also analyze the dependence of the spectral features on an electron-spot position for different particles morphologies. Our work demonstrates that the combination of the high spatial resolution of the transmission electron microscope and the high-energy resolution of a light detection system gives relevant information on optical modes
Myroshnychenko, Viktor
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Nelayah, Jaysen
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Stéphan, Odile
c17d5b79-320f-49f0-a130-53b8290b9692
Kociak, Mathieu
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Colliex, Christian
fb59d190-d90c-4ac3-9c65-2d635271d43a
Adamo, Giorgio
73480dbd-5d3e-415a-b569-9606b3dbeecc
MacDonald, Kevin F.
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Zheludev, Nikolay I.
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Carbó-Argibay, Enrique
b8ea0731-07e6-49d8-bee4-535e49879563
Rodríguez-Fernández, Jessica
ab43c59f-bc82-48b5-9cc8-d3d606ab8cec
Liz-Marzán, Luis M.
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García de Abajo, F.Javier
07e3df24-ab3b-4a70-af18-188db066aa1a
Myroshnychenko, Viktor
9ccf026d-a73b-4875-83f7-562106428540
Nelayah, Jaysen
3bbef210-59b9-43ca-9745-46b4af7c4c10
Stéphan, Odile
c17d5b79-320f-49f0-a130-53b8290b9692
Kociak, Mathieu
720c12ec-00ef-4047-8f70-ce14cfc5f3e5
Colliex, Christian
fb59d190-d90c-4ac3-9c65-2d635271d43a
Adamo, Giorgio
73480dbd-5d3e-415a-b569-9606b3dbeecc
MacDonald, Kevin F.
76c84116-aad1-4973-b917-7ca63935dba5
Zheludev, Nikolay I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Carbó-Argibay, Enrique
b8ea0731-07e6-49d8-bee4-535e49879563
Rodríguez-Fernández, Jessica
ab43c59f-bc82-48b5-9cc8-d3d606ab8cec
Liz-Marzán, Luis M.
1c2b0cbb-6a7c-4140-a20b-e3be393ad557
García de Abajo, F.Javier
07e3df24-ab3b-4a70-af18-188db066aa1a

Myroshnychenko, Viktor, Nelayah, Jaysen, Stéphan, Odile, Kociak, Mathieu, Colliex, Christian, Adamo, Giorgio, MacDonald, Kevin F., Zheludev, Nikolay I., Carbó-Argibay, Enrique, Rodríguez-Fernández, Jessica, Liz-Marzán, Luis M. and García de Abajo, F.Javier (2010) Electron energy loss spectroscopy and cathodoluminescence as powerful tools for studying surface-plasmon modes in metal nanostructures. SPIE Photonics Europe, Belgium. 12 - 16 Apr 2010.

Record type: Conference or Workshop Item (Paper)

Abstract

Metallic nanoparticles can interact strongly with external sources such as light or electron beam due to resonant excitation of surface plasmon modes which leads to strong electric field enhancements, particularly near edges and in gaps between metallic parts. The geometrical sensitivity of plasmon resonance allows one to play with size and shape of the particles in order to tune plasmon resonances to wavelengths of interest. This has given rise to an active research in finding new techniques for controlling size and shape of metallic nanoparticles.
The study of the near field associated with particle plasmons by optical means is limited by the low resolution. In contrast, the methods that are based on interaction of fast electrons with nanostructures allow one getting local information on plasmons with nanometer resolution. In particular, electron energy loss spectroscopy (EELS) and cathodoluminescence (CL) provide powerful tools for studying plasmons in metal nanostructures. The maxima in the energy loss spectra of transmitted electrons and maxima in the emission of light reflect the energies of the particle-plasmon excitations to which they couple.
In the present work we provide the experimental and theoretical analysis of energy loss suffered by fast electrons passing through or near system of metallic nanoparticles of different shapes as well as the resulting CL emission spectra. The theoretical results are calculated using the boundary element method based upon rigorous solution of Maxwell's equations. Plasmon modes in the metallic nanoparticles are observed. The dependence of the loss and emission spectra on a particle morphology is explored. We also analyze the dependence of the spectral features on an electron-spot position for different particles morphologies. Our work demonstrates that the combination of the high spatial resolution of the transmission electron microscope and the high-energy resolution of a light detection system gives relevant information on optical modes

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Published date: 16 April 2010
Venue - Dates: SPIE Photonics Europe, Belgium, 2010-04-12 - 2010-04-16

Identifiers

Local EPrints ID: 148965
URI: https://eprints.soton.ac.uk/id/eprint/148965
PURE UUID: 52a5f84b-72d2-4bad-8151-175fe95e6952
ORCID for Kevin F. MacDonald: ORCID iD orcid.org/0000-0002-3877-2976
ORCID for Nikolay I. Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

Catalogue record

Date deposited: 04 May 2010 14:07
Last modified: 06 Jun 2018 13:09

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Contributors

Author: Viktor Myroshnychenko
Author: Jaysen Nelayah
Author: Odile Stéphan
Author: Mathieu Kociak
Author: Christian Colliex
Author: Giorgio Adamo
Author: Enrique Carbó-Argibay
Author: Jessica Rodríguez-Fernández
Author: Luis M. Liz-Marzán
Author: F.Javier García de Abajo

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