Regensburg 2019 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: Plasmonics I (joint session O/CPP)

CPP 22.7: Talk

Tuesday, April 2, 2019, 12:00–12:15, H8

Probing surface plasmon with phase-shaped electron energy-loss spectroscopy — •Hugo Lourenco-Martins¹, Davy Gérard², Jo Verbeeck³, Giulio Guzzinati³, and Mathieu Kociak¹ — ¹Laboratoire de Physique des Solides, Université Paris-Saclay, France — ²L2n, Université de Technologie de Troyes, France — ³EMAT, University of Antwerp, Belgium

Electron energy loss spectroscopy (EELS) has attracted a large interest due to its efficiency in resolving plasmonic resonance at the nanometer scale. However, it remained intrinsically unable to detect plasmonic phase-related properties. Nevertheless, vortex electron states constitute a perfect candidate to overcome this limitation and measure optical dichroism in an electron microscope [1]. Moreover, it has been recently demonstrated that such probes can be created in an electron microscope by tailoring the phase of the beam [2]. In the present work [3], we developed a semiclassical formalism describing the interaction between an electron probe with an arbitrary phase profile and a plasmonic mode. We showed that the equation ruling this interaction takes the elegant form of a transition matrix between two electron states mediated by the eigenpotentials of the plasmon modes. In this contribution, we will present the theoretical formalism and a wide variety of numerical studies of interactions between different nano-structures and phase-shaped electron probes, with a special emphasis on the experimental feasibility of the proposed geometries. [1] Asenjo-Garcia et al. PRL 113 (2014) [2] Verbeeck et al, Nature 467 (2010) [3] Guzzinati et al., Nature Com. 8 (2017)