Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster II

Q 55.83: Poster

Donnerstag, 11. März 2010, 16:00–19:00, Lichthof

Brightness measurement of laser-triggered electrons from field emission tips — •Hanno Kaupp, Max Eisele, Markus Schenk, Michael Krüger, Johannes Hoffrogge, John Breuer, and Peter Hommelhoff — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching bei München, Germany

We have set up a source of laser triggered electrons emitted from sharp metal tips. Currently our group investigates the nature of the diverse emission processes possible [1]. Here we present a method to measure the brightness of laser-triggered electrons emitted from these sources. We employ a method based on Fresnel diffraction that occurs at a sharp edge in close proximity of the tip and observe the far-field diffraction pattern with a micro channel plate detector [2]. This is of high interest for future applications of ultrafast tip-based electron sources. We also focus on the development of alternative field emitters. Materials like gold offer laser-induced plasmon resonances which can greatly enhance the field at the tip apex. Modifications of tip geometry and material are presented and we report on the current status of our experiments. [1] See contributions by Markus Schenk et al. and Michael Krüger et al. [2] N. de Jonge et al., Nature 420, 393-395 (2002)