Dressing plasmons in particle-in-cavity architectures
Dressing plasmons in particle-in-cavity architectures
Placing metallic nanoparticles inside cavities, rather than in dimers, greatly improves their plasmonic response. Such particle-in-cavity (PIC) hybrid architectures are shown to produce extremely strong field enhancement at the particle?cavity junctions, arising from the cascaded focusing of large optical cross sections into small gaps. These simply constructed PIC structures produce the strongest field enhancement for coupled nanoparticles, up to 90% stronger than for a dimer. The coupling is found to follow a universal power law with particle?surface separation, both for field enhancements and resonant wavelength shifts. Significantly enhanced Raman signals are experimentally observed for molecules adsorbed in such PIC structures, in quantitive agreement with theoretical calculations. PIC architectures may have important implications in many applications, such as reliable single molecule sensing and light harvesting in plasmonic photovoltaic devices.
surface plasmon, surface-enhanced raman scattering, particle-in-cavity, power-law dependence, cascaded field enhancement, nanoparticle dimer
1221-1226
Huang, Fu Min
1e6fc160-8f6c-48f9-ad58-b993047b5a30
Wilding, Dean
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Speed, Jonathon D.
2855464c-be33-49cb-bbb3-b3996f97ad1e
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Baumberg, Jeremy J.
51423b5f-bdb8-4851-8d50-472253ceb12c
1 February 2011
Huang, Fu Min
1e6fc160-8f6c-48f9-ad58-b993047b5a30
Wilding, Dean
e9e07248-8eed-46c2-8eb7-97609e55578f
Speed, Jonathon D.
2855464c-be33-49cb-bbb3-b3996f97ad1e
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Baumberg, Jeremy J.
51423b5f-bdb8-4851-8d50-472253ceb12c
Huang, Fu Min, Wilding, Dean, Speed, Jonathon D., Russell, Andrea E., Bartlett, Philip N. and Baumberg, Jeremy J.
(2011)
Dressing plasmons in particle-in-cavity architectures.
Nano Letters, 11 (3), .
(doi:10.1021/nl104214c).
(PMID:21284375)
Abstract
Placing metallic nanoparticles inside cavities, rather than in dimers, greatly improves their plasmonic response. Such particle-in-cavity (PIC) hybrid architectures are shown to produce extremely strong field enhancement at the particle?cavity junctions, arising from the cascaded focusing of large optical cross sections into small gaps. These simply constructed PIC structures produce the strongest field enhancement for coupled nanoparticles, up to 90% stronger than for a dimer. The coupling is found to follow a universal power law with particle?surface separation, both for field enhancements and resonant wavelength shifts. Significantly enhanced Raman signals are experimentally observed for molecules adsorbed in such PIC structures, in quantitive agreement with theoretical calculations. PIC architectures may have important implications in many applications, such as reliable single molecule sensing and light harvesting in plasmonic photovoltaic devices.
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Published date: 1 February 2011
Keywords:
surface plasmon, surface-enhanced raman scattering, particle-in-cavity, power-law dependence, cascaded field enhancement, nanoparticle dimer
Organisations:
Chemistry
Identifiers
Local EPrints ID: 179393
URI: http://eprints.soton.ac.uk/id/eprint/179393
ISSN: 1530-6984
PURE UUID: 92650eb8-0d06-44ea-8ee1-a7f6434897e1
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Date deposited: 07 Apr 2011 10:45
Last modified: 15 Mar 2024 02:58
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Contributors
Author:
Fu Min Huang
Author:
Dean Wilding
Author:
Jonathon D. Speed
Author:
Jeremy J. Baumberg
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