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Imaging optical near fields at metallic nanoscale voids

Imaging optical near fields at metallic nanoscale voids
Imaging optical near fields at metallic nanoscale voids
Direct imaging of the electromagnetic fields generated by plasmon excitation at gold nanoscale voids is achieved with high spatial resolution using scanning near-field optical microscopy (SNOM). The spatial intensity distribution of the electromagnetic field in spherical Au void structures strongly depends on the light excitation wavelength and on the diameter and degree of truncation of the voids. Comparing the SNOM results with reflectivity measurements and boundary element calculations allows for a clear identification of the plasmon modes being activated in each case. The unique mapping of the high-field regions provides key information for the use of void nanostructures as substrates for surface-enhanced Raman scattering.
1550-235X
125410
Lacharmoise, P.D.
54492db0-e907-4976-9540-e1903bf470e9
Tognalli, N.G.
3bb50838-65fa-4fc3-8612-b6b7a3886b39
Goñi, A.R.
cf34bf27-7c04-437a-8119-572ff695ae4c
Alonso, M.I.
162c2db1-00a8-41d7-b894-49e888b7fae2
Fainstein, A.
e475b7f3-9df2-4bee-9f2b-f548ec5bc1f1
Cole, R.M.
8e80533f-f2f5-4b8e-bd02-d9807568728b
Baumberg, J.J.
78e1ea7e-8c70-404c-bf84-59aafe75cd07
Garcia de Abajo, J.
7077879f-707e-4062-aeef-d9ff49983715
Bartlett, P.N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Lacharmoise, P.D.
54492db0-e907-4976-9540-e1903bf470e9
Tognalli, N.G.
3bb50838-65fa-4fc3-8612-b6b7a3886b39
Goñi, A.R.
cf34bf27-7c04-437a-8119-572ff695ae4c
Alonso, M.I.
162c2db1-00a8-41d7-b894-49e888b7fae2
Fainstein, A.
e475b7f3-9df2-4bee-9f2b-f548ec5bc1f1
Cole, R.M.
8e80533f-f2f5-4b8e-bd02-d9807568728b
Baumberg, J.J.
78e1ea7e-8c70-404c-bf84-59aafe75cd07
Garcia de Abajo, J.
7077879f-707e-4062-aeef-d9ff49983715
Bartlett, P.N.
d99446db-a59d-4f89-96eb-f64b5d8bb075

Lacharmoise, P.D., Tognalli, N.G., Goñi, A.R., Alonso, M.I., Fainstein, A., Cole, R.M., Baumberg, J.J., Garcia de Abajo, J. and Bartlett, P.N. (2008) Imaging optical near fields at metallic nanoscale voids. Physical Review B, 78 (12), 125410. (doi:10.1103/PhysRevB.78.125410).

Record type: Article

Abstract

Direct imaging of the electromagnetic fields generated by plasmon excitation at gold nanoscale voids is achieved with high spatial resolution using scanning near-field optical microscopy (SNOM). The spatial intensity distribution of the electromagnetic field in spherical Au void structures strongly depends on the light excitation wavelength and on the diameter and degree of truncation of the voids. Comparing the SNOM results with reflectivity measurements and boundary element calculations allows for a clear identification of the plasmon modes being activated in each case. The unique mapping of the high-field regions provides key information for the use of void nanostructures as substrates for surface-enhanced Raman scattering.

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Published date: 15 September 2008

Identifiers

Local EPrints ID: 145037
URI: http://eprints.soton.ac.uk/id/eprint/145037
ISSN: 1550-235X
PURE UUID: 260e24f2-ba64-42d1-b92c-e4c9c8c01745
ORCID for P.N. Bartlett: ORCID iD orcid.org/0000-0002-7300-6900

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Date deposited: 15 Apr 2010 14:56
Last modified: 03 Dec 2019 02:04

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Contributors

Author: P.D. Lacharmoise
Author: N.G. Tognalli
Author: A.R. Goñi
Author: M.I. Alonso
Author: A. Fainstein
Author: R.M. Cole
Author: J.J. Baumberg
Author: J. Garcia de Abajo
Author: P.N. Bartlett ORCID iD

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