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Imaging optical near fields at metallic nanoscale voids

Record type: Article

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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Citation

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), p. 125410. (doi:10.1103/PhysRevB.78.125410).

More information

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

Catalogue record

Date deposited: 15 Apr 2010 14:56
Last modified: 18 Jul 2017 23:07

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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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