Hannover 2020 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 20: Ultrashort Laser Pulses and Biophotonics
Q 20.5: Vortrag
Dienstag, 10. März 2020, 15:00–15:15, f435
Attoseconds on a Chip - Time Domain Measurement of a Near-IR Transient — •Felix Ritzkowsky1, Mina Bionta2, Marco Turchetti2, Yujia Yang2, Karl Berggren2, Franz Kärtner1, and Phillip Keathley2 — 1Deutsches Elektronen Synchrotron (DESY) & Center for Free-Electron Laser Science, Notkestraße 85, 22607 Hamburg, Germany — 2Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
We report on a cross-correlation technique based on perturbation of local electron field emission rates that allows for the full characterization of arbitrary electric fields down to 4 fJ using plasmonic nanoantennas. Plasmonic nanoantennas in combination with ultrafast, few-cycle laser pulses allow for highly non-perturbative experiments that have previously only been demonstrated in the gas phase with high power, low repetition rate laser systems. By exploiting the plasmonic excitation in a metallic nanostructured device, electric field strengths exceeding ∼30 GV m−1 can be reached at the nanostructure with optical pulse energies of several tens of pJ. This enables sub-cycle attosecond electron bursts to be coherently driven by the electric near field of the plasmon, which we use to sample the near-infrared field-transients at the nanoantenna tip in-situ. These results are a strong indicator that this technique can resolve electric fields in amplitude and phase with a potential PHz bandwidth. Such an integrated field-sampler will enable time-domain spectroscopy methods similar to those that have been pioneered in the THz to be applied from the visible through the infrared.