Spectroscopy of optical modes with high spatial, temporal and energy resolution using electron-photon interference effects: A numerical study

Photon-Induced near-field electron microscopy has provided a way for time-resolved spectroscopy of the plasmonic resonances at high spatial resolution using pulsed electrons of sub-picosecond durations as probes, while an optical pulse is used to excite the structure at a very high photonic state. Here, by considering the electron´s self-radiation and the optical pulses, a numerical investigation of the effect of the optical intensities on the recorded spectra is demonstrated. It will be shown that by a deliberate tuning of the optical intensities, an interference pattern becomes visible, which can be used for the spectroscopy of plasmon modes with high temporal, energy and spatial resolution.