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Optimizing SERS from gold nanoparticle clusters: Addressing the near field by an embedded chain plasmon model

Optimizing SERS from gold nanoparticle clusters: Addressing the near field by an embedded chain plasmon model
Optimizing SERS from gold nanoparticle clusters: Addressing the near field by an embedded chain plasmon model

We study experimentally and theoretically the optimization of surface-enhanced Raman scattering (SERS) from nanoplasmonic clusters of gold nanoparticles separated by a fixed subnanometer gap. To maximize the enhancement we discuss how the optimal cluster size is influenced by the constituent nanoparticle size and illumination wavelength. We find good qualitative agreement between the experimental SERS from nanoparticle clusters and a simple composite model that describes the response of the full cluster as arising from a composition of linear nanochains. For fixed illumination wavelengths encountered experimentally it is best to choose a cluster size that supports its lowest energy resonance near this wavelength. Our chain simulations indicate the existence of an optimal length also when the illumination laser is continuously tuned to the frequency that maximizes the signal. We explain the optimal length under these illumination conditions with a simple model that accounts explicitly for radiative losses.

1932-7447
10512-10522
Taylor, Richard W.
14b4e086-50e8-4161-8314-7de98f1ef695
Esteban, Rubén
d5043d1a-afd0-4a4d-a01a-0cfe94693299
Mahajan, Sumeet
b131f40a-479e-4432-b662-19d60d4069e9
Aizpurua, Javier
17705349-38e3-4089-adba-547d02449095
Baumberg, Jeremy J.
51423b5f-bdb8-4851-8d50-472253ceb12c
Taylor, Richard W.
14b4e086-50e8-4161-8314-7de98f1ef695
Esteban, Rubén
d5043d1a-afd0-4a4d-a01a-0cfe94693299
Mahajan, Sumeet
b131f40a-479e-4432-b662-19d60d4069e9
Aizpurua, Javier
17705349-38e3-4089-adba-547d02449095
Baumberg, Jeremy J.
51423b5f-bdb8-4851-8d50-472253ceb12c

Taylor, Richard W., Esteban, Rubén, Mahajan, Sumeet, Aizpurua, Javier and Baumberg, Jeremy J. (2016) Optimizing SERS from gold nanoparticle clusters: Addressing the near field by an embedded chain plasmon model. The Journal of Physical Chemistry C, 120 (19), 10512-10522. (doi:10.1021/acs.jpcc.6b00506).

Record type: Article

Abstract

We study experimentally and theoretically the optimization of surface-enhanced Raman scattering (SERS) from nanoplasmonic clusters of gold nanoparticles separated by a fixed subnanometer gap. To maximize the enhancement we discuss how the optimal cluster size is influenced by the constituent nanoparticle size and illumination wavelength. We find good qualitative agreement between the experimental SERS from nanoparticle clusters and a simple composite model that describes the response of the full cluster as arising from a composition of linear nanochains. For fixed illumination wavelengths encountered experimentally it is best to choose a cluster size that supports its lowest energy resonance near this wavelength. Our chain simulations indicate the existence of an optimal length also when the illumination laser is continuously tuned to the frequency that maximizes the signal. We explain the optimal length under these illumination conditions with a simple model that accounts explicitly for radiative losses.

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More information

e-pub ahead of print date: 11 April 2016
Published date: 19 May 2016

Identifiers

Local EPrints ID: 415726
URI: http://eprints.soton.ac.uk/id/eprint/415726
ISSN: 1932-7447
PURE UUID: faaadc6e-d555-49ff-afff-b030044982ed
ORCID for Sumeet Mahajan: ORCID iD orcid.org/0000-0001-8923-6666

Catalogue record

Date deposited: 21 Nov 2017 17:30
Last modified: 10 Nov 2021 03:18

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Contributors

Author: Richard W. Taylor
Author: Rubén Esteban
Author: Sumeet Mahajan ORCID iD
Author: Javier Aizpurua
Author: Jeremy J. Baumberg

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