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HL: Fachverband Halbleiterphysik
HL 18: Focus Session: Nanoscale Light-matter Interaction I
HL 18.7: Vortrag
Dienstag, 18. März 2025, 12:30–12:45, H17
Attosecond electron microscopy using free-electron homodyne detection — •John H. Gaida1,2, Sergey V. Yalunin1,2, Hugo Lourenço-Martins1,2, Murat Sivis1,2, Thomas Rittmann1,2, Armin Feist1,2, F. Javier García de Abajo3,4, and Claus Ropers1,2 — 1MPI for Multidisciplinary Sciences, Göttingen, Germany — 24th Physical Institute, University of Göttingen, Germany — 3ICFO-Institut de Ciencies Fotoniques, Castelldefels (Barcelona), Spain — 4ICREA-Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain
Advancements in condensed matter science aim to map material structures and dynamics at levels of ångströms and attoseconds. Although X-ray and electron methods offer structural detail, attosecond temporal resolution is progressing through optical spectroscopy techniques. Techniques like PINEM allow nanometric resolution imaging of near-field intensities [1], but to examine the evolution of nanoscale fields and structures within the light cycle, optical phase sensitivity is needed, as provided by phase-contrast Lorentz PINEM [2], interferometric detection [3], or electron pulse bunching [4]. This contribution introduces Free-Electron Homodyne Detection (FREHD), a universally applicable approach for high spatiotemporal resolution imaging of phase-resolved optical responses [3].
[1] B. Barwick et al., Nature 462, 902–906 (2009). [2] J. H. Gaida et al., Nat. Commun. 14, 6545 (2023). [3] J. H. Gaida et al., Nat. Photonics 18 509–515 (2024). [4] K. E. Priebe et al., Nat. Photon. 11, 793–797 (2017).
Keywords: TEM; UTEM; Attosecond; Plasmonic