Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Ultrakurze Laserpulse: Anwendungen 3
Q 56.5: Vortrag
Donnerstag, 17. März 2011, 15:30–15:45, SCH A215
Light field control of electronic motion in condensed matter — •Agustin Schiffrin1, Tim Paasch-Colberg1,2, Daniel Gerstner2, Nicholas Karpowicz1, Sascha Mühlbrandt2, Joachim Reichert2, Johannes V. Barth2, Reinhard Kienberger1,2, Ralph Ernstorfer1,2,3, and Ferenc Krausz1,4 — 1Max-Planck-Institut für Quantenoptik, Garching, Germany — 2Technische Universität München, Germany — 3Fritz-Haber-Institut, Berlin, Germany — 4Ludwig-Maximilians-Universität, München, Germany
The advent of intense few-cycle near infrared (NIR) laser pulses with stable and tunable carrier envelope phase (CEP) has enabled the control of electromagnetic fields with attosecond time precision [1]. Here we aim at exploiting these few-cycle NIR optical fields with well-defined CEP to generate and control the motion of charge carriers within heterogeneous nanoscaled solid state interfaces. We demonstrate the generation of directly measurable photocurrents in unbiased gold-coated SiO2 nanogaps, whose magnitude and directionality can be tuned with the laser CEP. This effect vanishes with the increase of the laser pulse duration. We claim that such phenomenon is the signature of optically induced electron tunneling at the metal-dielectric interface with subsequent acceleration of the charge carrier in the ultrashort laser field. This ultrafast current injection at a nanoscaled condensed matter system represents a first step towards femtosecond lightwave electronics.
[1] Baltuska, A. et al. "Attosecond control of electronic processes by intense light fields" Nature 421, 611-615 (2003).