STEM-EELS: A Proper Tool for Observation of Strong Coupling Effects between Surface Excitations with High Spatial and Energy Resolution

Pavel Gallina, Michal Kvapil, Andrea Konečná, Michal Horák, Ora Bitton, Lothar Houben, Vlastimil Křápek, Gilad Haran, Juan Carlos Idrobo, Tomáš Šikola*

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

In recent years, strong coupling between different types of surface excitations, for instance, surface plasmon polaritons with excitons or phonon polaritons, has become a subject of growing interest. It has been caused by both fundamental and application research reasons covering new quantum nano-optics effects, electromagnetically induced transparency (EMT), chemical dynamics and reactivity, and other novel issues. Such an interesting physical phenomenon associated with the Rabi splitting and creation of new hybrid modes has been mostly studied by conventional reflection/transmission optical spectroscopic methods. However, using these techniques not all modes can be generated and observed. Therefore, there are attempts to study these coupling effects by application of electron beams capable of generating sub-radiant dark modes and being suitable for their detection by electron energy loss spectroscopy (EELS). To do it both at sufficient spatial (< 10 nm) and energy (≤ 100 eV) resolutions, STEM-EELS systems with monochromatized probe electron beams have to be used.
Original languageEnglish
Article numberozae044.739
Pages (from-to)1495-1496
Number of pages2
JournalMicroscopy and Microanalysis
Volume30
Issue numberSupplement_1
DOIs
Publication statusPublished - 24 Jul 2024

Funding

We acknowledge support from the EU H2020 project 810626 – SINNCE, Czech Science Foundation (Grant No. 20-28573S), Czech Science Foundation (Grant No. 20-28573S) and MEYS - Czech Republic (CzechNanoLab Research Infrastructure - LM2018110). EELS measurements were supported by the Center for Nanophase Materials Sciences (CNMS), which is a U.S. Department of Energy, Office of Science User Facility.

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