We report on the first realization of a hyperspectral imaging (HSI) technique of surface plasmon polaritons excited in metallic nanostructures by a scanning electron beam. The HSI image is formed by scanning a plasmonic structure with a focused electron beam, simultaneously recording the spectra of light emission from decoupled plasmons by a spectrum analyzer. By scanning the sample in this manner, one obtains a data cube consisting of the spatial coordinates of the position of the injected electron beam and the corresponding plasmon emission spectra. We performed plasmonic HSI on a dimer [1] consisting of two gold 100 nm decahedra on a carbon substrate (Fig. 1). For the dimer nanostructure we demonstrate its imaging as a plasmonic nanostructure, visualizing its plasmonic modes, and we identify the electron beam excitation of symmetric, asymmetric and hybridization modes (Fig.2).
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