Project Details
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Ultrafast lensless imaging with plasmonic enhanced XUV generation

Subject Area Optics, Quantum Optics and Physics of Atoms, Molecules and Plasmas
Term from 2014 to 2020
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 259173236
 
Final Report Year 2022

Final Report Abstract

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.

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