Hannover 2016 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 8: Laser Plasmas I

P 8.8: Vortrag

Dienstag, 1. März 2016, 16:30–16:45, b302

Strong Pinch Generation in Nanowires — •Vural Kaymak¹, Alexander Pukhov¹, Vyacheslav N. Shlyaptsev², and Jorge Rocca^2,3 — ¹Theoretische Physik 1, Heinrich Heine Universität Düsseldorf, Düsseldorf, Deutschland — ²Department of Electrical Computer Engineering, Colorado State University, Fort Collins, Colorado, USA — ³Department of Physics, Colorado State University, Fort Collins, Colorado, USA

Structured surfaces or surfaces covered with nanoparticles, such as nanowire arrays, have shown to facilitate a significantly higher absorption of laser energy as compared to flat surfaces. Due to the efficient coupling of the laser energy, highly energetic electrons are produced, which in turn can emit x-ray pulses of down to subpicosecond duration and energies up to several hundred keV. The x-rays generated this way can be used for time-resolved diffraction to track ultrafast dynamics in physical and chemical systems. Other applications of laser-produced plasmas are the generation of accelerated MeV ions and fusion neutrons. In the present work we use full three dimensional PIC simulations to analyze the behaviour of Carbon nanowire arrays irradiated by a 400 nm linearly-polarized laser beam with a length of 60 fs at FWHM and intensities up to 2.7·10²¹ W/cm². We analyze the generated electron currents, which reveal to be accompanied by a quasistatic azimuthal magnetic field. This field exerts a pressure on the nanowire causing it to pinch.