Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 50: Plasmonics & Nanooptics III: STM and Time-Resolved Methods (joint session O/CPP)

O 50.6: Vortrag

Mittwoch, 3. April 2019, 11:45–12:00, H8

A versatile setup utilizing shaped optical pulses and time-resolved photoemission electron microscopy to disentangle the ultrafast local response of nanostructured surface systems — •Sebastian Pres¹, Bernhard Huber¹, Daniel Fersch¹, Enno Krauss², Daniel Friedrich², Victor Lisinetskii¹, Matthias Hensen¹, Bert Hecht², and Tobias Brixner¹ — ¹Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — ²Nano-Optics & Biophotonics Group, Experimentelle Physik 5, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

The possibility to disentangle local field dynamics on nanometer length scales is an important prerequisite for the exploration of interactions between nanostructures and nearby quantum systems.
We combine time-resolved aberration-corrected photoemission electron microscopy, enabling sub-10 nm spatial resolution, with a widely tunable laser source generating sub-20 fs excitation pulses at 1 MHz repetition rate. Phase-stable pulse sequences are formed by liquid-crystal-based pulse shaping and characterised by Fourier-transform spectral interferometry. A detailed knowledge of each pulse sequence’s amplitude and phase structure during the measurement allows to quantitatively analyse the influence of the pulse shape and laser spectrum on resulting time-resolved multidimensional spectroscopy signals. Using coherent 2D nanoscopy [1] we investigate local field dynamics within a plasmonic nanoslit resonator.
[1] M. Aeschlimann et al., Nat. Photonics, Vol. 9 (2015)