Electron Imaging of Nanoscale Charge Distributions Induced by Femtosecond Light Pulses
Fuente:
arXiv
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Preprint |
| Published: |
2023
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866910575962882048 |
|---|---|
| author | Weber, Jonathan T. Schäfer, Sascha |
| author_facet | Weber, Jonathan T. Schäfer, Sascha |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_10272 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Electron Imaging of Nanoscale Charge Distributions Induced by Femtosecond Light Pulses Weber, Jonathan T. Schäfer, Sascha Mesoscale and Nanoscale Physics Optics 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. |
| title | Electron Imaging of Nanoscale Charge Distributions Induced by Femtosecond Light Pulses |
| topic | Mesoscale and Nanoscale Physics Optics |
| url | https://arxiv.org/abs/2308.10272 |