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O: Fachverband Oberflächenphysik

O 18: Plasmonics and Nanooptics II: Ultrafast and Nonlinear Phenomena (joint session O/CPP)

O 18.4: Vortrag

Montag, 16. März 2020, 16:00–16:15, WIL A317

THz streaking spectroscopy for mapping the transformation from far-fields to nanostructure near-fields — •Felix Sommer and Georg Herink — Physikalisches Institut EP VIII, Universität Bayreuth

Field-driven experiments at the nanoscale require the precise characterization of local ultrafast transients. We apply THz near-field streaking spectroscopy [1,2] to metallic nanotips to map the enhanced near-field at the apex.

The local waveforms are critical to various emerging ultrafast instruments for nanoscopic imaging and spectroscopy. The transformation of focused far-fields to nanoscale near-fields sensitively depends on either the individual nano- and macroscopic geometry and structure, involving effects of antenna resonances, plasmon excitations and excitation geometries [3,4]. In order to study the THz-response in the time-domain, we developed an optimized near-field streaking setup based on a strong-field THz source and present experimental data on the THz-waveform transformation.

[1] Wimmer et al., Nat. Phys. 10, 432-436 (2014).

[2] Wimmer et al., APL 111(13), 131102 (2017).

[3] Talebi et al., ACS nano 9(7), 7641-7648 (2015).

[4] Schröder et al., PRB 92(8), 085411 (2015).