Download Attosecond Experiments on Plasmonic Nanostructures: by Johannes Schötz PDF

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 crucial part for the improvement of light-wave-electronics, the regulate and guidance of electron dynamics with the frequency of sunshine, which provides a speed-up via numerous orders of importance in comparison to traditional electronics. The experiments awarded right here on metal nanotips, commonplace in experiments and purposes, don't basically exhibit the feasibility of attosecond streaking as a special software for primary reviews of ultrafast nanophotonics but in addition symbolize a primary very important step in the direction of this goal.

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9 a)).

1 shows a schematic overview of the lasersystem used in our experiments. The lasersource is as commercially available chirped-pulse amplifier (FEMTOPOWER Compact Pro). 5 nJ pulses with a duration of 7 fs covering a spectral range from 620 nm to 1000 nm at a repetition rate of 70 MHz. It is equipped with a module for CEP-stabilization (see subsequent section). A pulse-picker sends pulses at a repetition rate of 1 kHz to the subsequent amplification stage. Then the pulses are sent through a SF-57 glass stretcher where they are elongated to around 10 ps by introducing negative chirp.

3 b). The process of ionization and recollision repeats every half cycle and leads to the production of attosecond pulse trains. Secondly, for few-cycle laser-pulses the maximum electric field amplitude depends on the CE-phase (see Fig. 1) and with that through Eq. 6 the maximum photon energy produced in HHG. For φCE = 0, the highest photon energies are produced only during the central halfcycle. By spectrally filtering out the highest energy photons, which are only produced during the central half-cycle, isolated attosecond pulses can be generated.

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