Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 11: Ultrafast and Nonlinear Plasmonics
O 11.6: Talk
Monday, March 16, 2015, 16:15–16:30, MA 004
Shaping and spatiotemporal characterization of sub-10-fs pulses focused by a high-NA objective — •Sebastian Goetz1, Monika Pawlowska1, Christian Dreher1, Matthias Wurdack1, Enno Krauss2, Peter Geisler2, Gary Razinskas2, Bert Hecht2,3, and Tobias Brixner1,3 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Nano-Optics and Biophotonics Group, Experimentelle Physik 5, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 3Röntgen Center for Complex Material Systems (RCCM), Am Hubland, 97074 Würzburg, Germany
For the investigation of ultrafast processes on the nanoscale by far-field radiation, the temporal resolution of femtosecond laser pulses has to be combined with the spatial resolution of a high-NA microscope. We combine confocal microscopy with phase and amplitude pulse shaping of few-cycle NIR pulses using an LCD pulse shaper in 4f single-pass geometry. By utilizing the pulse compression algorithm PRISM, a pulse length of 10 fs could be achieved at the focus position. The capability of the setup is demonstrated by investigating the influence on the diffraction-limited focus of a high-NA objective, LCD imperfections and spatio-temporal coupling. By scanning of gold nanorods through the focal plane, position-dependent reflections within the focus reveal the spectrally resolved intensity profile and the spatial dependency of the pulse arrival time. The ability to shape the light fields and the availability of high peak powers open the path to all-optical control of near-field propagation in the linear and nonlinear regimes.