Using numerical simulation we demonstrate the appearance of Fano interference effects in the electron energy-loss spectroscopy (EELS) and cathodoluminescence (CL) of nanorod dimers that are heterogeneous in both material composition and physical dimension. An electron probe is capable of exciting both optically bright and dark plasmons of each monomer unit due to its differing selection rules relative to the plane wave. Yet, interferences are still manifested in the EELS and CL spectra of the dimer for certain electron trajectories due to the rapid p-phase offset in the polarizations between super-radiant and sub-radiant hybridized plasmon modes of the dimer. Depending upon the location of the electron beam, we predict the conditions under which Fano interferences will be present in both optical and electron spectroscopies (EELS and CL) as well as a new class of Fano interferences that are uniquely electron-driven and are absent in the optical response.

Using continuum electrodynamic simulations to predict the appearance of Fano resonances in the electron energy-loss spectroscopy and cathodoluminescence of metal nanodimers

246th National Meeting (2013)

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