Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 64: Poster Wednesday: Plasmonics and Nanooptics

O 64.3: Poster

Mittwoch, 3. April 2019, 17:45–20:00, Poster B1

Electron-induced photon injection at single-mode glass fibres in transmission electron microscopy — •Vincent Hock, Christopher Rathje, Niklas Müller, Holger Koch, and Sascha Schäfer — University Oldenburg

Transmission electron microscopy (TEM) provides a versatile platform for the investigation of electron-light interaction at the nanoscale [1]. Utilizing femtosecond electron pulses and transient localized light fields, ultrafast TEM experiments have opened new avenues for the coherent optical control of free-electron wave packets [2-4]. Translating these developments to an optical control of continuous electron beams remains challenging. Here, we report on the current status of our investigations on high-energy electron beams interacting with guided modes in optical fibres. Utilizing a home-build TEM sample holder incorporating an on-axis tapered glass fibre, we demonstrate electron-induced light injection into the single-mode fibre with a spatially inhomogeneous injection efficiency. Photon count rates, light spectra and photon statistics are discussed considering different electron-light coupling mechanisms, including coherent transition radiation as well as cathodoluminescence processes.

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