Format

Send to

Choose Destination
See comment in PubMed Commons below
Opt Lett. 2007 Aug 1;32(15):2254-6.

Near-field spectroscopy of surface plasmons in flat gold nanoparticles.

Author information

  • 1Physics Department, University of Massachusetts, Amherst, Massachusetts 01003, USA. achermann@physics.umass.edu

Abstract

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.

PMID:
17671601
[PubMed]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Optical Society of America
    Loading ...
    Support Center