My research focuses on electronic properties of surface plasmon polaritons (SPPs) and localized surface plasmons (LSPs) generated by tunable femtosecond laser pulses. The former are confined surface evanescent electromagnetic waves, which decay as well as propagate along metal/dielectric interfaces whereas the latter are local modes constrained within the coupling structures that decay through many channels such as radiative emission or generation of hot electrons. Both phenomena exist on a nanometer scale and femtosecond time regime, thereby requiring instrumentation that is capable of multidimensional imaging to capture the complexity of plasmonic phenomena. The research I have conducted so far has focused on crystalline silver nano/micro structures grown on silicon substrate in situ within an ultrahigh vacuum chamber. The studies of the plasmonic structures are performed within an Aberration-Corrected Low Energy Electron Microscope/Photoemission Electron Microscope (AC-LEEM/PEEM) system.