Tailoring the emissive properties of photocathodes through materials engineering: Ultra-thin multilayers

â¿¢High quality epitaxial ultra-thin MgO/Ag/MgO multilayers were grown.â¿¢Work function and quantum efficiency were tuned by changing the thickness of the MgO layers.â¿¢High brightness and low work function metallic cathodes were achieved.â¿¢Angular emission through the use of ARPES show a narrow angular dispersion of valence electrons.