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SUMMARY:Instrumental developments in ultrafast transmission electron micro
 scopy
DTSTART:20231208T150000
DTSTAMP:20260414T175514Z
UID:6968e709e01d139c3fb44701f50e150a5c28c6d9dd68185541426567
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Sasha Schäfer\, University of Regensburg\nTime-resolve
 d variants of transmission electron microscopy have started to provide an
  unparalleled view into the fast and ultrafast dynamics of solid-state na
 nostructures. A crucial instrumental pre-requisite for constructing the n
 ext generation of time-resolved electron microscopes is the development o
 f novel pulsed electron sources\, fast detectors and versatile sample exc
 itation schemes. In this talk\, I will summarize our recent developments 
 and characterization of a laser-driven cold-field emitter source (in coll
 aboration with JEOL Ltd.)\, including the achieved electron pulse duration
 \, spectral width\, and electron beam brightness. A first application of t
 hese high-brightness electron pulses for the imaging of wavelength-depende
 nt optical near-fields in transition metal dichalcogenides will be present
 ed.\n\nIn the second part\, I will focus on the application of event-based
  TimePix3 electron detectors in fast electron imaging. Using a neural ne
 twork approach trained by experimental data with synchronized  femtosecon
 d electron pulses\, we can improve the time-resolution of the  TimePix3 d
 etector utilizing the intrinsic correlations within event clusters. Final
 ly\, as two applications for event-based electron imaging\, I will discuss
  the excitation and phase-resolved mapping of nonlinear Duffing modes in a
  silicon membrane and the time-resolved Lorentz imaging of photoinduced ch
 arging in metal nanoparticles.
LOCATION:MA A3 31 https://plan.epfl.ch/?room==MA%20A3%2031
STATUS:CONFIRMED
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