Christos Tserkezis

Time- and Frequency-Domain Study for Electron Beams Penetrating Dielectric Nanospheres: Fingerprints of Cherenkov and Transition Radiation

Abstract We present a theoretical study of Cherenkov and transition radiation for swift electron beams penetrating dielectric nanospheres using material models of different sophistication. Specifically, we perform a combined time-domain (numerically, via the discontinuous Galerki...

Probing Strong Coupling in Core–Shell Nanoparticles With Fast Electron Beams

Collective optical excitations, such as localized surface plasmons in metallic nanoparticles and Mie resonances in high‐index dielectrics, play a central role in nanoscale light–matter interactions. When interacting with electronic transitions in matter, they can couple strongly,...