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Nano Lett. 2011 Mar 9;11(3):1280-3. doi: 10.1021/nl1043242. Epub 2011 Feb 14.

On the energy shift between near-field and far-field peak intensities in localized plasmon systems.

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Laboratory for Nanophotonics, M.S. 61, Rice University , Houston, Texas 77005-1892, United States.


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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