Manipulating the electron wavefunction with a 4D-TEM
The EPFL Photonics Chapter (EPC) is very pleased to announce and cordially invite you to our monthly ‘Pizza-Optics-Beer’ (POB) seminar on March 21st 2018 (next Wednesday) at 18:15 in the room CM 1 106.
This month we will have the pleasure to host Gabriele Berruto from the Laboratory for Ultrafast Microscopy and Electron Scattering (LUMES) with the presentation entitled:
"Attosecond coherent manipulation of the free electron wavefunction via inelastic electron-photon scattering"
For organizational purposes (if you want to eat pizza!), please confirm your participation using this Doodle.
Don’t hesitate to extend the invitation to any postdoc and colleague!
Hope to see you there,
The team of the EPFL Photonics Chapter
Abstract:
In free space, photon absorption or emission by electrons is forbidden by energy and momentum conservation laws. However, in the proximity of a surface, those conditions are relaxed, and the inelastic electron-photon scattering can take place. By the control of the interaction with two phase- locked semi-infinite light fields, the time, energy, space, and momentum distribution of the free electrons can be manipulated with sub-femtosecond precision.
In the first part, I will introduce the topic and show the recent efforts of the community, with a focus on the activities carried out in the 4D Transmission Electron Microscope at LUMES-EPFL.
In the second part, I will show how the non-local interference of the optical beam with a surface plasmon, mediated by an electron, allows to map the surface plasmon dynamics with attosecond resolution. I will finally discuss how the electron wavefunction can be shaped in space, for example transferring orbital angular momentum to the electron beam.