Regensburg 2025 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 29: Poster II
HL 29.56: Poster
Tuesday, March 18, 2025, 18:00–20:00, P1
Time resolved electron imaging of a high-Q nonlinear nanomechanical oscillator — •Kai Nettersheim1, Alexander Schröder1, and Sascha Schäfer1,2 — 1Department of Physics, University of Regensburg, Regensburg, Germany — 2Regensburg Center for Ultrafast Nanoscopy (RUN), Regensburg, Germany
While micro-electromechanical systems are well adapted for probing nonlinear dynamics in nanomechanical systems, they are often limited in their spatial resolution. Recent advances in ultrafast electron microscopy (UTEM) [1] enable the highly localized probing of nanoscale oscillator dynamics as well as their atomic structure and material defects.
Here, we present the characterization of non-linear free-standing silicon membranes by UTEM imaging techniques using an event-based electron detector with nanosecond temporal resolution. By exiting the sample with a modulated continuous wave laser the sample is driven into the nonlinear regime, resulting in Duffing resonances with high quality factors of up to 105. We experimentally characterized the temperature and fluence dependencies of the resonance as well as the mode shapes involved and compare these to finite-element simulations.
[1] A. Schröder et al., arXiv:2410.23961v1 (2024)
Keywords: MEMS; Ultrafast Transmission Electron Microscopy; Nonlinear Dynamics; Duffing Oscillators