Attosecond Experiments on Plasmonic Nanostructures: by Johannes Schötz

By Johannes Schötz

Johannes Schötz provides the 1st measurements of optical electro-magnetic near-fields round nanostructures with subcycle-resolution. the power to degree and comprehend light-matter interactions at the nanoscale is a vital part for the improvement of light-wave-electronics, the regulate and steerage of electron dynamics with the frequency of sunshine, which offers a speed-up by means of numerous orders of value in comparison to traditional electronics. The experiments awarded the following on steel nanotips, known in experiments and purposes, don't simply reveal the feasibility of attosecond streaking as a special software for primary experiences of ultrafast nanophotonics but additionally signify a primary vital step in the direction of this goal.

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They are then sent to the AS5-lasertable, where they pass through a telescope before entering the pulse compressor, which implements a hybrid approach. First a prism-compressor is used to precompress the pulses. However to avoid pulse distortions due to optical nonlinearities in the last prism caused by high-intensities the pulses are not fully compressed. This is achieved in second stage with a set of highly dispersive mirrors. 6 mJ. To avoid beam-pointing instabilities a beam-stabilization system, which measures pointing fluctuations via Position-Sensitive-Detectors (PSD), is employed before and after the compressor.

5: The photoemission process in the three step picture. where A is the vector potential. State-of-the-art models use density functional theory (DFT) to calculate the inital state and are thus able to consistently incorporate the crystal symmetry and effects such as surface reconstruction and recombination [39]. The models differ in the treatment of the final state and electron scattering within the solid. In the one-step model the final state is generally computed by Quantum Field theoretical methods as a state which behaves asymptotically as a free electron and which is scattered inside the solid.

The quasiparticle nature of the photoelectron can be accounted for by using an energy dependent group velocity vG . [42]. The third step is the transmission through the surface, where the electron is transmitted with a probability T and diffracted. Furthermore by passage through the surface, the electron might excite surface plasmons. The advantage of the three-step model is that it treats different effects such as propagation and transmission as distinct steps, which does not only simplify the description but also allows to describe the the different effects with different degrees of accuracy.

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