March 7, 2017

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 facility to degree and comprehend light-matter interactions at the nanoscale is a crucial part for the improvement of light-wave-electronics, the keep an eye on and steerage of electron dynamics with the frequency of sunshine, which supplies a speed-up by means of numerous orders of value in comparison to traditional electronics. The experiments offered the following on steel nanotips, ordinary in experiments and functions, don't simply reveal the feasibility of attosecond streaking as a different software for basic reports of ultrafast nanophotonics but additionally symbolize a primary vital step in the direction of this goal.

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Extra resources for Attosecond Experiments on Plasmonic Nanostructures: Principles and Experiments

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4 Electron scattering in solids Electron scattering in solids is a problem encountered in many experiments for example Reflection Electron Energy Loss Spectroscopy (REELS), Low Energy Electron Diffraction (LEED), Transmission Electron Microscopy (TEM) and also in radiation therapy, radiationprotection and for radiation detectors. In Scattering theory generally two types of scattering are distinguished, namely elastic and inelastic scattering. In inelastic scattering events, part of the energy of the projectile is used to promote the target to a different internal state, while in elastic scattering it remains the same.

This is a nonlocal effect, which is difficult to handle in calculations. Therefore Vex (r) is derived from the local-density-approximation (LDA) of a homogeneous electron gas (HEG). The terms Vst and Vex are used in other calculations too and correspond to a first order Born-approximation [51], which is asymptotically exact for high energy electrons. For lower energies the polarization and the absorption of the atom play a role. Vcp is the correlationpolarization potential which accounts for the polarization via the classical long range polarization potential and the electron screening via a short range correlation potential obtained from LDA.

For fine-tuning and compensation of day-to-day variations a pair of glass wedges is used. A small portion of the beam is sent into another CEPstabilization system. The rest of the beam is sent to the experiment. 2 CEP-stabilization The generation of isolated attosecond pulses used in streaking spectroscopy heavily relies on waveforms with a controlled CEP. In our setup the CEP is controlled at two different positions namely directly at the oscillator and after the spectral broadening in the hollow-corefiber and two different techniques are employed.

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