Hannover 2020 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 7: Nano-Optics (Microscopy and Plasmonics)
Q 7.5: Vortrag
Montag, 9. März 2020, 15:15–15:30, a310
Few-cycle oscillator-based nonlinear and strong-field nanooptics — •Liping Shi1,2, Uwe Morgner1,2, and Milutin Kovacev1,2 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover — 2Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering - Innovation AcrossDisciplines), Hannover, Germany
The study of strong-field nonlinear optical effects usually relies on a chirped-pulse amplifier system, which will unwantedly stretch the pulse duration and sacrifice the repetition rate of a seeded oscillator. Here we employ plasmonic and Mie-type optical nanoantennas to amplify the electric near-field strength of a few-cycle Ti:Sapphire oscillator, demonstrating unique advantages of the oscillator-based nonlinear and strong-field effects. First, we can produce a nanoscale ultra-broadband deep ultraviolet light source. Second, due to the giant field gradient in the vicinity of optical nanoantennas, a post-tunneling electron experiences a strong ponderomotive acceleration. This results in a novel mechanism of femtosecond near-field ablation and thin-film deposition. Third, the high-repetition rate of the low-fluence oscillator allows us to investigate some effects that require low-threshold while multi-shot exposure, such as the self-enhanced nonlinear response of silicon nanodisks resonant at anapole modes.