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We describe the implementation and detailed characterization of a laser-triggered field-emitter electron source integrated into a modified transmission electron microscope. Specifically, localized linear photoemission from the front facet of a tip-shaped ZrO/W(100) Schottky emitter is employed, yielding electron pulses with a spectral bandwidth of 0.6 eV and pulse durations down to 200 fs (full-width-at-half-maximum)...
Ultrafast transmission electron microscopy is a promising laser-pump electron-probe technique, which allows for studying ultrafast dynamics with both high spatial and temporal resolution [1]. Besides, the high spatial and temporal coherence of the pulsed electron beam enables a coherent manipulation of the free-electron quantum state [2] by inelastic scattering in optical near-fields [3-5]. Upon traversal...
We present the development of the first ultrafast transmission electron microscope (UTEM) driven by localized photoemission from a field emitter cathode. We describe the implementation of the instrument, the photoemitter concept and the quantitative electron beam parameters achieved. Establishing a new source for ultrafast TEM, the Göttingen UTEM employs nano-localized linear photoemission from a...
Photon-induced scattering of swift electrons with confined light is studied by ultrafast transmission electron microscopy (UTEM) and employed to locally map optical near-fields. Fluence-dependent kinetic energy spectra reveal quantum coherent scattering features.
Laser-driven metal needle emitters offer great potential for low emittance pulsed electron sources as required in ultrafast transmission electron microscopy. Here, we experimentally and theoretically study site-selective photoelectron emission in a field emitter geometry.
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