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Orbital angular momentum and energy loss characterization of plasmonic excitations in metallic nanostructures in TEM

Zanfrognini, Matteo; Rotunno, Enzo; Frabboni, Stefano; Sit, Alicia; Karimi, Ebrahim; Hohenester, Ulrich; Grillo, Vincenzo

Recently,  a  new  device  to  measure  the  Orbital  Angular  Momentum  (OAM) electronic  spectrum  after  elastic/inelastic  scattering  in  a  transmission  electron  microscope  has been  introduced.  We  modified  the  theoretical  framework  needed  to  describe  conventional  low loss electron energy loss spectroscopy (EELS) experiments in transmission electron microscopes (TEM)  to study surface plasmons in metallic nanostructures,  to allow for an  OAM post selection and devise new experiments for the analysis of these excitations in nanostructures. We found that unprecedented information on the symmetries and on the chirality of the plasmonic modes can be retrieved even with limited OAM and energy resolutions.

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