Abstract

By focusing propagating surface plasmons, electromagnetic energy can be delivered to nanoscale volumes. In this context, we employ electron energy loss spectroscopy in a scanning transmission electron microscope to characterize the full plasmonic mode spectrum of a silver thin film tapered to a sharp tip. We show that the plasmon modes can be ordered in film and edge modes and corroborate our assignment through supplementary numerical simulations. In particular, we find that the focused plasmon field at the taper tip is fueled by edge modes.

© 2015 Optical Society of America

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Supplementary Material (1)

NameDescription
» Visualization 1: MP4 (1398 KB)      EEL map movies simulated by the Matlab toolbox MNPBEM

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