Chair Richard Taïeb, U. Pierre et Marie Curie, Paris, France

#49, 12:00 – 12:30 Attosecond clocking of electron collisions in dielectric nanoparticles, M. F. KLING, F. CALEGARI, S. ZHEREBTSOV, Q. LIU, P. RUPP, L. SEIFFERT, A. TRABATTONI, M. CASTROVILLI, S. ANUMULA, F. SÜßMANN, K. WINTERSPERGER, J. STIERLE, G. SANSONE, L. POLETTO, F. FRASSETTO, V. MONDES, C. GRAF, E. RÜHL, F. KRAUSZ, M. NISOLI, AND T. FENNEL, We investigated electron dynamics following ionization by an attosecond pulse at 35 eV in dielectric nanoparticles using attosecond streaking spectroscopy. Single-shot velocity-map imaging permits to identify laser shots with and without nanoparticles. The time delay between the respective streaking traces of ~100 as is interpreted by scattering theory indicating that the measurements permit to clock the inelastic electron scattering time.

#50, 12:30 – 12:45 Attosecond Near-Field Streaking from Metal Nanotips, B. FÖRG, J. SCHÖTZ, F. SÜßMANN, M. FÖRSTER, M. KRÜGER, B. AHN, K. WINTERSPERGER, S.ZHEREBTSOV, A. GUGGENMOS, V. PERVAK, A. KESSEL, S. A. TRUSHIN, A. M. AZZEER, M. I. STOCKMAN, D. KIM, F. KRAUSZ, P. HOMMELHOFF, AND M.F. KLING, The vision of attosecond temporal and nanoscale spatial resolution for the investigation of collective electron motion gave birth to the new research field of attosecond nanophysics. One major goal is the complete characterization of nanoscale optical fields with sub-cycle temporal resolution. We report on achieving this goal by the experimental implementation of attosecond near-field streaking. By comparing streaking traces from gold nanotips to a reference from a noble gas, we show that the spectral response of the nanotip near-field arising from intense laser excitation can be extracted. Monte-Carlo (MC) trajectory simulations in near-fields calculated using the macroscopic Maxwell’s equations support our experimental findings.

#51, 12:45 – 13:00 Intense supercontinuum and few – cycle pulses generated in condensed media, CHIH-HSUAN LU, BO-HAN CHEN, HONG-YU CHEN, YU-JUNG TSOU, YU-CHEN CHENG, PEI-CHI HUANG, SHANG-DA YANG,  MING-CHANG CHEN, AND A. H. KUNG, We overcame the large material dispersion and avoided optical damage to generate an intense octave-spanning supercontinuum in a solid medium that could be compressed to produce fewcycle pulses with multi-GW peak power and demonstrated high harmonic generation using these pulses.

#52, 13:00 – 13:15 Extreme ultraviolet coherence tomography with high harmonic generation light sources, S. FUCHS, J. BIEDERMANN, M. WÜNSCHE, J. BERNERT, C. RÖDEL, M. MÖLLER, AND G. G. PAULUS, We present a novel method for cross sectional imaging with nanometer resolution which is referred to as XUV coherence tomography (XCT). XCT uses extreme ultra violet light (XUV), e.g., from high harmonic generation (HHG).  In XCT, the coherence length of few nanometers of broadband XUV sources is exploited. Thus, XCT extends optical coherence tomography (OCT) by improving the axial resolution from micrometers to nanometers. In a first step, we demonstrated XCT at synchrotron sources, successfully. Here, we present first results of XCT with High Harmonic Generation sources.