This project focuses on the numerical characterization of sub-wavelength

nanostructured photocathodes, which are a promising technology for

improving photoemission quantum efficiency. By engineering the surface

of the photocathode with a periodic array of nanogrooves, the structure

can support a Surface-Plasmon-Polariton (SPP) mode. When coupled with

an excitation laser pulse, this SPP mode enhances photon absorption,

resulting in an increase in quantum efficiency (QE) and a reduction in the

power requirements for the photocathode-laser system.

This research aims to contribute to the development of more efficient

electron sources for future applications, particularly in the context of

high-duty-cycle upgrades at facilities like the European XFEL (EuXFEL).