We theoretically investigate electron energy loss spectroscopy (EELS) of metallic nanoparticles in the optical frequency domain. Using a quasistatic approximation scheme together with a plasmon eigenmode expansion, we show that EELS can be rephrased in terms of a tomography problem. For selected single and coupled nanoparticles we extract the three-dimensional plasmon fields from a collection of rotated EELS maps. Our results pave the way for a fully three-dimensional plasmon-field tomography and establish EELS as a quantitative measurement device for plasmonics.
@article{arxiv.1308.0508,
title = {Tomography of particle plasmon fields from electron energy loss spectroscopy},
author = {Anton Hörl and Andreas Trügler and Ulrich Hohenester},
journal= {arXiv preprint arXiv:1308.0508},
year = {2015}
}