Probing the symmetry of the potential of localized surface plasmon resonances with phase-shaped electron beams

Giulio Guzzinati (), Armand Béché, Hugo Lourenço-Martins, Jérôme Martin, Mathieu Kociak and Jo Verbeeck
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Giulio Guzzinati: EMAT, University of Antwerp
Armand Béché: EMAT, University of Antwerp
Hugo Lourenço-Martins: Laboratoire de Physique des Solides, Univ. Paris-Sud, CNRS UMR 8502
Jérôme Martin: Institut Charles Delaunay—Laboratoire de nanotechnologies et d’instrumentation optique, UMR CNRS 6281, Université de Technologie de Troyes
Mathieu Kociak: Laboratoire de Physique des Solides, Univ. Paris-Sud, CNRS UMR 8502
Jo Verbeeck: EMAT, University of Antwerp

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Plasmonics, the science and technology of the interaction of light with metallic objects, is fundamentally changing the way we can detect, generate and manipulate light. Although the field is progressing swiftly, thanks to the availability of nanoscale manufacturing and analysis methods, fundamental properties such as the plasmonic excitations’ symmetries cannot be accessed directly, leading to a partial, sometimes incorrect, understanding of their properties. Here we overcome this limitation by deliberately shaping the wave function of an electron beam to match a plasmonic excitations’ symmetry in a modified transmission electron microscope. We show experimentally and theoretically that this offers selective detection of specific plasmon modes within metallic nanoparticles, while excluding modes with other symmetries. This method resembles the widespread use of polarized light for the selective excitation of plasmon modes with the advantage of locally probing the response of individual plasmonic objects and a far wider range of symmetry selection criteria.

Date: 2017
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DOI: 10.1038/ncomms14999

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