Dr. Ivan Madan

Dr. Ivan Madan is a postdoctoral researcher at École polytechnique fédérale de Lausanne (EPFL) in the team of F. Carbone. His research concerns applications of ultrafast electron microscopy to problems of quantum and condensed matter physics. In this line he and the team of which he is a member have developed and implemented in a TEM machine ultrafast Lorentz imaging, non-local holographic imaging techniques and light-based phase-masks for electrons. The systems in which he is interested are topological magnets, plasmonic systems, multilayer graphene and strongly correlated materials.

Tentative title of talk: ”Using light to control electrons”

LUMES

Abstract
Longitudinal and transverse modulation of electron wave function with light, and its application to electron microscopy
Ivan Madan*+, Giovanni Vanacore*, Gabriele Berruto*, Enrico Pomarico*, Javier García de Abajo**, Ido Kaminer***, Fabrizio Carbone*
* École Polytechnique Fédérale de Lausanne, Switzerland
**ICFO-Institut de Ciencies Fotoniques, Spain
ICREA-Institucío Catalana de Recerca i Estudis Avançats, Spain
**Technion—Israel Institute of Technology, Israel
+Corresponding author: ivan.madan@epfl.ch

Conventional electron microscopy operates with flat electron wave fronts, affected by aberrations of the instrumentation. Transverse modulation of wave fronts, employing attenuative or electrostatic phase plates allows for better sensitivity to a particular scattering channel or for change of the phase contrast transfer function. In this contribution, we will show how utilization of light from coherent ultrafast source can be used to modulate electrons phase both transversally and longitudinally. This result in a plethora of phenomena, as well as conceptually new techniques such as non-local electron holography of light fields and generation of ultrafast electron vortex beams.