By Johannes Schötz
Johannes Schötz offers 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 advance of light-wave-electronics, the keep an eye on and guidance of electron dynamics with the frequency of sunshine, which delivers a speed-up via numerous orders of value in comparison to traditional electronics. The experiments awarded the following on metal nanotips, wide-spread in experiments and purposes, don't merely exhibit the feasibility of attosecond streaking as a special software for primary experiences of ultrafast nanophotonics but additionally symbolize a primary very important step in the direction of this goal.
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Extra info for Attosecond Experiments on Plasmonic Nanostructures: Principles and Experiments
This single plasmon peak can be observed even with a broadband XUV excitation and has even been measured with attosecond streaking . The variation of the DCS is shown in Fig. 8 b). The general smallangle scattering characteristic already mentioned above, increases with energy. There exist a number of databases, most prominently from NIST . They usually only provide IMFPs, and don’t give DIIMFPs and DCSs which are necessary for Monte Carlo simulations. This is the reason why we took the eﬀort of implementing the above algorithms.
The resulting spectrum I(ω) of the overlap of the fundamental and SHG is measured via a spectrometer and is given by : I(ω) = If (ω)+I2f (ω)+ If (ω)I2f (ω)cos(φf (ω)−φ2f (ω)+ωτ +φCE ). 5) Due to the delay τ of the spectral components of fundamental and SHG signal a modulation of the measured intensity occurs in the region of spectral overlap. This modulation is shifted φCE . By Fourier analysing the modulation, the relative CEP can be calculated . By a feedback on one of the prisms in the hybrid compressor, the dispersion can be changed and the CEP stabilized.
For higher energy losses and momentum transfers a ridge can be observed, the so-called Betheridge, which asymptotically approaches a dispersion of q 2 . Physically that means that for high energy and momentum transfers the inelastic scattering can be treated as being caused by interaction with free electrons . To check the inﬂuence of the inelastic scattering properties on the employed model, we performed calculations of the inelastic mean free path and the diﬀerential cross section with the Drude-Lindhard model, the Mermin-model and the ﬁtless procedure of Ding and Shimizu .
Attosecond Experiments on Plasmonic Nanostructures: Principles and Experiments by Johannes Schötz