Efficient modal-expansion discrete-dipole approximation: Application to the simulation of optical extinction and electron energy-loss spectroscopies

Stéphane-Olivier Guillaume, F. Javier García De Abajo, Luc Henrard

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    Abstract

    An efficient procedure is introduced for the calculation of the optical response of individual and coupled metallic nanoparticles in the framework of the discrete-dipole approximation (DDA). We introduce a modal expansion in the basis set of discrete dipoles and show that a few suitably selected modes are sufficient to compute optical spectra with reasonable accuracy, thus reducing the required numerical effort relative to other DDA approaches. Our method offers a natural framework for the study of localized plasmon modes, including plasmon hybridization. As a proof of concept, we investigate optical extinction and electron energy-loss spectra of monomers, dimers, and quadrumers formed by flat silver squares. This method should find application to the previously prohibited simulation of complex particle arrays.

    Original languageEnglish
    Article number245439
    Number of pages10
    JournalPhysical Review B
    Volume88
    Issue number24
    DOIs
    Publication statusPublished - 26 Dec 2013

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    F. Javier García de Abajo

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