Electron Imaging of Nanoscale Charge Distributions Induced by Femtosecond Light Pulses
arXiv:2308.10272 · doi:10.1021/acs.nanolett.4c00773
Abstract
Surface charging is a phenomenon ubiquitously observable in in-situ transmission electron microscopy of non-conducting specimens as a result of electron beam/sample interactions or optical stimuli and often limits the achievable image stability and spatial or spectral resolution. Here, we report on the electron-optical imaging of surface charging on a nanostructured surface following femtosecond-multiphoton photoemission. By quantitatively extracting the light-induced electrostatic potential and studying the charging dynamics on the relevant timescales, we gain insights into the details of the multi-photon photoemission process in the presence of a background field. We study the interaction of the charge distribution with the high-energy electron beam and secondary electrons and propose a simple model to describe the interplay of electron- and light-induced processes. In addition, we demonstrate how to mitigate sample charging by simultaneous optical illumination of the sample.
29 pages; Manuscript with 4 figures and Supporting Information with 1 additional figure and 4 videos
References in corpus (5)
- New electron source concept for single-shot sub-100 fs electron diffraction in the 100 keV range
- Coherent interaction between free electrons and a photonic cavity
- A light induced metastable magnetic texture uncovered by in-situ Lorentz microscopy
- Nanoscale diffractive probing of strain dynamics in ultrafast transmission electron microscopy
- Improving the temporal resolution of event-based electron detectors using neural network cluster analysis