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Optics Letters

Optics Letters


  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 15 — Aug. 1, 2007
  • pp: 2254–2256

Near-field spectroscopy of surface plasmons in flat gold nanoparticles

M. Achermann, K. L. Shuford, G. C. Schatz, D. H. Dahanayaka, L. A. Bumm, and V. I. Klimov  »View Author Affiliations

Optics Letters, Vol. 32, Issue 15, pp. 2254-2256 (2007)

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We use near-field interference spectroscopy with a broadband femtosecond, white-light probe to study local surface plasmon resonances in flat gold nanoparticles (FGNPs). Depending on nanoparticle dimensions, local near-field extinction spectra exhibit none, one, or two resonances in the range of visible wavelengths ( 1.6 2.6 eV ) . The measured spectra can be accurately described in terms of interference between the field emitted by the probe aperture and the field reradiated by driven FGNP surface plasmon oscillations. The measured resonances are in good agreement with those predicted by calculations using discrete dipole approximation. We observe that the amplitudes of these resonances are dependent upon the spatial position of the near-field probe, which indicates the possibility of spatially selective excitation of specific plasmon modes.

© 2007 Optical Society of America

OCIS Codes
(180.5810) Microscopy : Scanning microscopy
(300.0300) Spectroscopy : Spectroscopy
(320.0320) Ultrafast optics : Ultrafast optics

ToC Category:
Ultrafast Optics

Original Manuscript: March 9, 2007
Revised Manuscript: May 18, 2007
Manuscript Accepted: May 21, 2007
Published: July 27, 2007

Virtual Issues
Vol. 2, Iss. 9 Virtual Journal for Biomedical Optics

M. Achermann, K. L. Shuford, G. C. Schatz, D. H. Dahanayaka, L. A. Bumm, and V. I. Klimov, "Near-field spectroscopy of surface plasmons in flat gold nanoparticles," Opt. Lett. 32, 2254-2256 (2007)

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