Regensburg 2019 – wissenschaftliches Programm
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 . 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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