Helmholtz decomposition analysis of electron energy loss: Differentiating resonances on polarization and radiation eigenmodes

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Helmholtz decomposition analysis of electron energy loss: Differentiating resonances on polarization and radiation eigenmodes
Title:
Helmholtz decomposition analysis of electron energy loss: Differentiating resonances on polarization and radiation eigenmodes
Other Titles:
Journal of the Optical Society of America B
Publication Date:
14 May 2019
Citation:
Abstract:
Helmholtz decomposition is a powerful mathematical tool for investigation and analysis of vector fields, particularly in electrodynamic systems. In this paper, we apply it to electron energy loss spectroscopy of magnetically inactive structures to get insight into field composition of energy losses. The obtained results show that losses are incurred through two pathways—excitation of transverse/longitudinal fields by solenoidal/conservative currents. Separation of these processes gives us important information about the fields and the type of eigenmodes (polarization or radiation) being in resonance with the electron beam. Capabilities of such analysis are demonstrated in the study case of metal nanofilms and nanodiscs, where we perform differentiation of the resonances that have occurred on plasmons (polarization eigenmodes) and plasmon polaritons (radiation eigenmodes).
License type:
PublisherCopyrights
Funding Info:
Joint grant program of National Research Foundation Singapore (NRF) and Agence Nationale de la Recherche (ANR) France (NRF2016-NRF-ANR002).
Description:
© 2020 Optical Society of America]. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
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