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A: Fachverband Atomphysik

A 24: Attosecond physics I

A 24.8: Vortrag

Donnerstag, 17. März 2011, 18:15–18:30, BAR 205

Attosecond dynamics in few-cycle laser driven electron emission from sharp metal tips — •Markus Schenk, Michael Krüger, and Peter Hommelhoff — Max-Planck-Insitut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching bei München, Germany

By focusing low-power few-cycle Ti:Sa pulses tightly onto sharp tungsten tips strong-field effects such as peak suppression and peak shifting in ATP spectra have been observed [1,2]. Here we use carrier-envelope phase (CEP) stabilized pulses and measure the electron energy spectra for varying CEP. We observe a CEP dependent modulation in the current that increases in amplitude to about 40% for higher-energetic electrons. Furthermore we observe a clear change in the spectral peak visibility when the phase is changed by π. These findings can be understood in the picture of time-energy interferometry of the electron emission. For a double slit, fringes result in the energy domain, whereas no fringes result for the single slit. We compare our experimental findings with numerical integration of the time-dependent Schrödinger equation and find good agreement. With this interpretation sub-optical cycle (attosecond) and electric-field sign sensitive emission dynamics results. This system is complementary in nature to atomic systems, which is why we expect it to answer open questions of attosecond physics.

[1] M. Schenk, M. Krüger, P. Hommelhoff, accepted for publication in Physical Review Letters (2010)

[2] see contribution of M. Krüger et al. at this conference