Journal
NANO LETTERS
Volume 11, Issue 3, Pages 1280-1283Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl1043242
Keywords
Plasmonics; nanoparticle; SERS; field enhancement
Categories
Funding
- Robert A. Welch Foundation [C-1222]
- NSF [CNS-0821727]
- U.S. Department of Energy
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The localized plasmons of metallic nanoparticles and nanostructures are known to display an interesting and apparently universal phenomenon: upon optical excitation, the maximum near-field enhancements occur at lower energies than the maximum of the corresponding far-field spectrum. Here we present an explanation for this behavior, showing that it results directly from the physics of a driven and damped harmonic oscillator. We show that the magnitude of the shift between the near- and far-field peak intensities depends directly on the total damping of the system, whether it is intrinsic damping within the metal of the nanoparticle or radiative damping of the localized plasmon.
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