Ultrakurze Bildgebung mit Hilfe plasmonen verstärkter Erzeugung von EUV Strahlung
Zusammenfassung der Projektergebnisse
The goal of the present project was the investigation of extreme ultraviolet (XUV) coherent light generation assisted by plasmonic resonances, which enable to achieve high local enhancements of the participating electric fields. The XUV light generation from nanostructures and their properties are studied with the aim to exploit this as a probe for propagation dynamics on time scales reaching the attosecond regime. Application experiments using this nanostructure-based XUV source are demonstrated involving ultrafast coherent diffractive imaging. The proposed methodology relies on novel designs for nanostructures, comprising plasmonic and dielectric approaches, the investigation on strong field effects and state-of-the-art intense ultrafast laser sources. One outcome of the project is the application of resonant bowtie antennas to enhance the electric field of a low-fluence femtosecond oscillator, where we experimentally demonstrate highly localized reshaping of the antennas, resulting in a self-optimization of the antenna shape. In addition we investigated the field enhancement occurring during guided light propagation. Making use of isolated nanoscale dielectric cones from ZnO showed perturbative and non-perturbative harmonic emission. Another outcome is the study on the dynamics of ionization by using novel asymmetric plasmonic nanojunctions indicating that the electron flight time is well-determined by the mean ponderomotive velocity in the driving field.
Projektbezogene Publikationen (Auswahl)
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(2019) ‘All semiconductor enhanced high-harmonic generation from a single nanostructured cone’, Scientific Reports, 9(1), p. 5663
Franz, D. et al.
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(2019) ‘Generating Ultrabroadband Deep-UV Radiation and Sub-10 nm Gap by Hybrid-Morphology Gold Antennas’, Nano Lett., 19 (7), p. 4779-4786
Shi, L., Andrade, José R C, et al.
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(2019) ‘Nanoscale Broadband Deep-Ultraviolet Light Source from Plasmonic Nanoholes’, ACS Photonics, 6(4), pp. 858–863
Shi, L., Andrade, José R. C., et al.
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(2020) ‘Progressive Self-Boosting Anapole-Enhanced Deep-Ultraviolet Third Harmonic During Few-Cycle Laser Radiation’, ACS Photonics, 7(7), pp. 1655–1661
Shi, L. et al.
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(2021) ‘Femtosecond Field‐Driven On‐Chip Unidirectional Electronic Currents in Nonadiabatic Tunneling Regime’, Laser & Photonics Reviews, 15(8), p. 2000475
Shi, L. et al.
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(2021) ‘Plasmon-Amplified Third Harmonic Generation in Metal/Dielectric Resonators’, Plasmonics
Nicolas, R. et al.
