Sep 18 – 24, 2022
Hotel Hermitage, La Biodola Bay, Isola d'Elba, Italy
Europe/Rome timezone

Phase shaping of the free-electrons wavefunction with fs-laser pulses in an RF-cavity-based UTEM

Sep 20, 2022, 7:20 PM
Sala Elena - Hotel Hermitage

Sala Elena - Hotel Hermitage

Poster (student) Poster Session


Simona Borrelli (TU/Eindhoven)


Interest is growing around developing techniques to shape the wavefunction of electrons.
We propose to use the time-dependent electromagnetic fields of ultrashort laser pulses to control the quantum-mechanical phase of electron pulses. We present a theoretical model showing that the ponderomotive interaction between electrons and a high-intensity strongly-focused laser beam can be used to develop a non-material phase-shaper. This contribution also a model of the interaction, in which we derive a quantal phase from the classical action integral along the relativistic classical path. Results extend to realistic configurations of the electromagnetic fields. Our model proves that a phase-shift of π/2 can be achieved by focusing the laser pulses produced by a fs-oscillator to a waist size of 2𝜆. Any phase shift can be induced by suitably varying the laser power and spot size.
An application of the method is the development of light-based phase-plates for phase contrast imaging of weakly scattering specimens. A light-based phase-plate ensures a stable, tunable phase shift, helping overcome material device limitations.
We provide details on the experimental realization of the device in an RF-cavity-based ultrafast transmission electron microscope that has a 75 MHz fs-oscillator integrated into its setup.

Primary authors

Simona Borrelli (TU/Eindhoven) Mr S.T. Kempers (TU/Eindhoven) Mr W. Schaap (TU/Eindhoven) Dr P.H.A. Mutsaers (TU/Eindhoven) Dr E. Kieft (ThermoFisher Scientific) Dr B. Buijsse (ThermoFisher Scientific) Prof. O.J. Luiten (TU/Eindhoven) Prof. K.A.H. van Leeuwen (TU/Eindhoven)

Presentation materials