Hrvoje Petek investigates ultrafast phenomena in solid state materials and at solid surfaces. Petek and his group have developed a method for investigating the coherent electromagnetic fields and excited electron distributions with 60 nm spatial and less than 10 fs temporal resolution. The time-resolved (TR)-PEEM is currently employed to study the time evolution of propagating and localized surface plasmon fields in metal films and metallic nanostructures. The time evolution of plasmonic fields is recorded with phase-related external excitation fields at a rate of 330 attoseconds/frame (one-fourth of the optical cycle).