Surface plasmon excitations in metal spheres: Direct comparison of light scattering and electron energy-loss spectroscopy by modal decomposition
American Physical Society
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Collins, S., & Midgley, P. (2013). Surface plasmon excitations in metal spheres: Direct comparison of light scattering and electron energy-loss spectroscopy by modal decomposition. http://www.dspace.cam.ac.uk/handle/1810/244692
In previous publications, qualitative agreement between studies of surface plasmon excitations in nanoparticles by near field light scattering and electron energy-loss spectroscopy (EELS) has been found for experiments and simulations. Here, we present a quantitative method for the comparison of light scattering and EELS for surface plasmons in metal spheres. Defining the Fourier transform of the modal component of the scattered electric field along the equivalent electron trajectory enables a direct evaluation of the relative weighting factor for light- and electron-excited surface plasmon modes. This common quantity for light scattering and EELS is examined for size, composition, and trajectory dependencies, facilitating the analysis of key differences between light and electron excitation. A single functional dependence on Drude model plasmon energies is identified to explain the relative modal weighting factors for light scattering and EELS. This method represents an important step toward the complete spectral and spatial reconstruction of EELS maps from near field light scattering calculations.
Electron energy-loss spectroscopy, Surface Plasmons
S.M.C. acknowledges the support of a Gates Cambridge Scholarship. The research leading to these results has received funding from the European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement 291522-3DIMAGE. P.A.M. also acknowledges funding from the European Union's Seventh Framework Programme under a contract for an Integrated Infrastructure Initiative (Reference 312483-ESTEEM2).
European Research Council (291522)
EC FP7 CP WITH CSA (312483)
This record's URL: http://www.dspace.cam.ac.uk/handle/1810/244692