Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 5: Zeitaufgelöste Spektroskopie I
O 5.1: Vortrag
Freitag, 4. März 2005, 10:45–11:00, TU EB107
Ultrafast adaptive nano-photonics — •Walter Pfeiffer1, Tobias Brixner1, Johannes Schneider1, and F.J. García de Abajo2 — 1Physikalisches Institut, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Centro Mixto CSIC-UPV/EHU, Apartado 1072, 20080 San Sebastián, Spain
The time-resolved investigation of nanoscale transport phenomena requires localizing pump and probe excitation both for different times and at different locations. This requires a method for controlling independently the electric field evolution at closely neighboring locations. Here we present a rather general scheme that allows us to achieve this control over the spatial and temporal field distribution below the diffraction limit in the optical near field of a metal nanostructure. The scheme is based on interferences of optical near-field modes that are controlled by the excitation with polarization-shaped laser pulses. It is demonstrated that the interaction of optimally polarization-shaped femtosecond laser pulses with metal nanostructures allows controlling the spatial and temporal evolution of the electromagnetic near field. This control with simultaneous but independent nanometer length and femtosecond time resolution opens a new realm for ultrafast spectroscopy on the nanoscale and will allow novel quantum control schemes.