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).