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O: Fachverband Oberflächenphysik
O 108: Electron-Driven Processes at Surfaces and Interfaces
O 108.1: Vortrag
Donnerstag, 19. März 2020, 15:00–15:15, TRE Ma
Probing Optical Modes of Gold Tapers Using Electron Beams — •Nahid Talebi1, Surong Guo1, Martin Esmann2, Mathieu Kociak3, Christoph Lienau2, and Peter van Aken1 — 1Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany — 2Birkenweg 20 — 3Laboratoire de Physique des Solides, Universitet Paris Sud, Orsay 91400, France
Three-dimensional gold tapers have fabulous applications in adiabatic nanofocusing (ACS Nano 6 (7), 6040-6048 (2012)), tailoring photoemission processes (ACS Photonics 5 (9), 3584-3593 (2018)), and optical microscopy (Rev. Sci. Inst. 75, 837 (2004)). Recently, it has been also demonstrated that through a combination of adiabatic nanofocusing and scanning-near-field optical microscopy, weak and strong interactions between nanostructures and gold tips can be nicely probed (Nature Nanotechnology 14, 698*704(2019)). Here, we investigate the interaction of optical gold tapers with electron beams. Using electron-energy loss spectroscopy (Nano letters 16 (10), 6137-6144 (2016)) and cathodoluminescence (ACS photonics 6 (10), 2509-2516 (2019)), optical modes of gold tapers are thoroughly investigated, covering both radiating and nonradiating modes. Moreover, we will show that the synchronization of the electron beams with the launched plasmons with high angular momentum orders lead to pronounced resonances in the electron-energy-loss spectra.