Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 68: Matter Wave Optics I
Q 68.6: Vortrag
Freitag, 27. März 2015, 12:30–12:45, K/HS2
High spatial coherence of laser-triggered electron pulses from metal nanotips — Dominik Ehberger1,2, Jakob Hammer1,2, Max Eisele2, •Michael Krüger1,2, Jonathan Noe3, Alexander Högele3, and Peter Hommelhoff1,2,4 — 1Department of Physics, Friedrich Alexander University Erlangen-Nuremberg, D-91508 Erlangen, Germany — 2Max Planck Institute of Quantum Optics, D-85748 Garching, Germany — 3Ludwig Maximilian University of Munich, D-80799 München, Germany — 4Max Planck Institute for the Science of Light, D-91508 Erlangen, Germany
A spatially coherent source of laser-induced electron pulses is highly desirable for applications in ultrafast electron imaging and quantum optics with electronic matter waves. Metal nanotips are known to possess excellent coherence properties when operated as DC-field emitters and are widely used in electron imaging and holography. The spatial coherence of a laser-triggered nanotip source of electrons, however, has not been quantified so far.
Here, we compare the coherence properties of a tungsten tip triggered by near-UV pulses and operated in DC-field emission. The effective source radius reff commonly used for quantifying spatial coherence is deduced from electron biprism interference patterns at a freestanding carbon nanotube. We measure reff ≤ (0.80 ± 0.05)nm in laser triggered and reff ≤ (0.55 ± 0.02)nm in DC-field emission, revealing that spatial coherence is nearly fully retained in a one-photon emission process. We expect that our findings have important consequences for ultrafast electron imaging.