Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 71: Poster: Plasmonics and Nanooptics

O 71.15: Poster

Mittwoch, 20. März 2024, 18:00–20:00, Poster D

Improved electron spectrometer for PINEM experiments in an SEM — •Isabella Probst¹, Roy Shiloh², Johannes Illmer¹, Franz Schmidt-Kaler¹, and Peter Hommelhoff¹ — ¹Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Deutschland — ²Hebrew University, Jerusalem, Israel

Photon-induced near-field microscopy (PINEM) was demonstrated as a method for imaging electromagnetic fields with femtosecond time resolution. It has developed into intriguing electron light coupling experiments. When electrons interact with an optical nearfield, they can absorb or emit an integer number of photons, modulating the electron spectrum. Most PINEM experiments have been performed in transmission electron microscopes (TEMs). Scanning electron microscopes (SEMs) provide larger sample chambers, are less cost intensive and offer a different range of electron energies. In our SEM-PINEM setup, the electron energy is measured with a custom-built spectrometer [1]. To improve the spectral resolution of our spectrometer, we designed a magnetic lens-based telescope. The performance of the lenses for different positions, coil currents and electron energies was simulated. This improved system will allow investigating a plethora of materials and effects, previously unreachable in an SEM, with improved clarity.

[1] Shiloh, Chlouba, Hommelhoff, PRL 128, 235301 (2022)

Keywords: PINEM; electron optics; magnetic lens