Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 108, Issue 50, Pages 19879-19884Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1113563108
Keywords
nanoparticle self-assembly; photothermal heterodyne imaging; surface plasmon resonance; single particle spectroscopy; dark-field imaging
Categories
Funding
- Robert A. Welch Foundation [C-1664, C-1703]
- National Science Foundation (NSF) [CHE-0955286, DMR-0547399, DMR-1105878]
- Office of Naval Research [N00014-10-1-0989]
- 3M
- Richard E. Smalley Institute
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0955286] Funding Source: National Science Foundation
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Coupled surface plasmons in one-dimensional assemblies of metal nanoparticles have attracted significant attention because strong interparticle interactions lead to large electromagnetic field enhancements that can be exploited for localizing and amplifying electromagnetic radiation in nanoscale structures. Ohmic loss (i.e., absorption by the metal), however, limits the performance of any application due to nonradiative surface plasmon relaxation. While absorption losses have been studied theoretically, they have not been quantified experimentally for strongly coupled surface plasmons. Here, we report on the ohmic loss in one-dimensional assemblies of gold nanoparticles with small interparticle separations of only a few nanometers and hence strong plasmon coupling. Both the absorption and scattering cross-sections of coupled surface plasmons were determined and compared to electrodynamic simulations. A lower absorption and higher scattering cross-section for coupled surface plasmons compared to surface plasmons of isolated nanoparticles suggest that coupled surface plasmons suffer smaller ohmic losses and therefore act as better antennas. These experimental results provide important insight for the design of plasmonic devices.
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