Hard X-ray Generation from ZnO Nanowire Targets in a Non-Relativistic Regime of Laser-Solid Interactions

Zhanna Samsonova,Olga Rosmej,Daniil Kartashov,Ingo Uschmann,Robert Röder,Christian Spielmann,Carsten Ronning,Lukas Trefflich,Tino Kämpfer,Sebastian Höfer,Eckhart Förster

doi:10.3390/app8101728

Zhanna Samsonova, Olga Rosmej + Show 9 more

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https://doi.org/10.3390/app8101728

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We present a detailed investigation of X-ray emission from both flat and nanowire zinc oxide targets irradiated by 60 fs 5 × 1016 W/cm2 intensity laser pulses at a 0.8 µm wavelength. It is shown that the fluence of the emitted hard X-ray radiation in the spectral range 150–800 keV is enhanced by at least one order of magnitude for nanowire targets compared to the emission from a flat surface, whereas the characteristic Kα line emission (8.64 keV) is insensitive to the target morphology. Furthermore, we provide evidence for a dramatic increase of the fast electron flux from the front side of the nanostructured targets. We suggest that targets with nanowire morphology may advance development of compact ultrafast X-ray sources with an enhanced flux of hard X-ray emission that could find wide applications in highenergy density (HED) physics.

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Plasma-based ultrafast X-ray sources are of great importance for many intriguing applications [1].They provide well-defined line and continuous emission that can be used for time-resolved X-ray spectroscopy of high-density matter
We report on the experimental investigation of characteristic line and hard X-ray emission generated in zinc oxide (ZnO) semiconductor nanowire targets of different morphologies, irradiated by ultrashort laser pulses at intensities below 1017 W/cm2
We have experimentally investigated the influence of ZnO target morphology on X-ray emission

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Plasma-based ultrafast X-ray sources are of great importance for many intriguing applications [1]. They provide well-defined line and continuous emission that can be used for time-resolved X-ray spectroscopy of high-density matter. Such ultrashort duration (femtosecond to picosecond time scale) sources of X-ray emission can be designed using an interaction of intense ultrashort laser pulses with solids. From a practical point of view of applications in X-ray spectroscopy, high-repetition rate sources of X-rays are of great importance. Small scale, mJ-level energy, and kHz repetition rate laser systems are

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