Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Poster: Electronic Structure of Surfaces and Spectroscopy of Surface States
O 37.8: Poster
Dienstag, 19. März 2024, 18:00–20:00, Poster D
Implementation of a fiber-based cathodoluminescence detector system for an ultrafast scanning electron microscope — •Filip Majstorovic1, Paul H. Bittorf1, and Nahid Talebi1,2 — 1Institute for Experimental and Applied Physics, Kiel University, Leibnizstraße 19, D-24118 Kiel, Germany — 2Kiel Nano, Surface and Interface Science KiNSIS, Kiel University, Christian-Albrechts-Platz 4, D-24118 Kiel, Germany
When high-energy electron beams interact with materials, light can be emitted by the excited sample. This radiation is known as coherent or incoherent cathodoluminescence (CL), depending on the underlying interaction mechanism, and gained a major interest in the study of minerals, semiconductors and plasmonic resonances in nanoparticles, where both spectral and temporal statistics can be unraveled. Due to the high spatial resolution and large spectral excitation bandwidth of the electron beams inside an SEM, electrons locally probe photonic modes, resulting in the capability to image their spatial near-field distribution via CL spectroscopy. Here, we report on the construction of a fiber-based CL detector for an SEM. We present first measurements to prove the ability for raster scanning the samples CL emission using fibers. Additionally, this detector is implemented inside an ultrafast SEM (USEM) setup for realizing a time-resolved electron-light pump-probe measurement configuration, where the luminescence of a sample, coming from the excitation either with electron or laser pulses, will be spatially resolved. This will be used to improve the USEM setup and analyze the dynamics of electron-light-matter interaction.
Keywords: cathodoluminescence spectroscopy; fiber-based detection; electron-light-matter interaction; ultrafast SEM