Download PDF by Johannes Schötz: Attosecond Experiments on Plasmonic Nanostructures:

By Johannes Schötz

ISBN-10: 3658137126

ISBN-13: 9783658137120

ISBN-10: 3658137134

ISBN-13: 9783658137137

Johannes Schötz offers 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 crucial part for the improvement of light-wave-electronics, the regulate and steerage of electron dynamics with the frequency of sunshine, which grants a speed-up by way of numerous orders of significance in comparison to traditional electronics. The experiments offered right here on metal nanotips, commonly used in experiments and functions, don't merely show the feasibility of attosecond streaking as a distinct instrument for primary reviews of ultrafast nanophotonics but additionally characterize a primary very important step in the direction of this goal.

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56]). For a few model systems (q, Q) is approximately known analytically, for example the homogeneous electron gas. However these models are often not sufficient to describe the complex structure in real solids. The most successful strategy for real materials is the Optical Data Model. It parametrizes the ELF at q = 0 and varies some of the parameters with q according to semi-empirical models. The two most commonly used algorithms are the extended Drude model and the Drude-Lindhard model. 2 Inelastic Scattering 47 In the extended Drude model the dielectric function is expressed as a sum of Drude-terms (see Eq.

Comparing these two equations we obtain: 1 dσ e2 −1 . 16) · Im N = dωdq (2π)2 0 v 2 q (q, w) Note that the integral limits in Eq. 15 come from kinetic considerations whereas in Eq. 13, we didn’t impose such restrictions yet. Using the inelastic mean free path λ = 1/N σ and the electron energy E, the above expression can be written as dλ−1 1 1 = Im dQdq aB πE q −1 . 17) Eq. 17 is the central equation in this chapter. It divides the scattering in a projectile dependent term and a material dependent term, the energy loss function (ELF) Im(−1/ (q, Q)).

This is beyond the scope of this thesis. 3 Surface Scattering As the electron approaches the surface it interacts with the surface plasmon modes. This interaction is dependent on the distance to the surface and leads to a change in the energy loss probability compared to the bulk. An extensive literature exists on this problem for plane surfaces (see [54] for an excellent introduction and overview). g. [69]). 9: a) Illustration of surface and bulk surface losses. b) The surface loss function for q = 0 of gold computed from [62].

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Attosecond Experiments on Plasmonic Nanostructures: Principles and Experiments by Johannes Schötz

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