Efficient generation and transportation of energetic electrons in a carbon nanotube array target

Abstract

Electron field emission properties of carbon nanotubes during thermal heating and laser irradiation

Stabilization of beam-weibel instability by equilibrium density ripples

“…Ji et al 34 have obtained the similar results by 2-D PIC simulations of an Ultrashort laser pulse interaction with a CNT array target. An immediate prediction of our work, which may be put to experimental test is that the structured targets with long scale ripples (much longer than skin depth) should not lead to significant improvement in collimation because in this case coupling to neighboring sidebands will not significantly stabilize the instability.…”

Enhanced energy coupling by using structured nano-wire targets

“…The yields associated to the CNT and graphite targets significantly differ at low intensities. At high intensities, the average Cu-K yield from CNT target is found to be 2.3 times larger than that from graphite, and exceeds by 30% the yield from the Cu foil (the maximum error is 10%) as observed in the previous literature [5,6]. The reduced difference in K yield at high intensities may stem from the expansion of the uniformization of the CNT plasmas during the interaction, resulting in plasma profiles in front of the Cu substrate similar to those obtained from non-structured targets.…”

Control of the hot electrons produced by laser interaction with nanolayered target

“…14 An important issue in almost all applications is to have high conversion efficiency for laser-to-hot electron energy. Different types of targets have been proposed, including targets with subwavelength gratings, 15 velvet surfaces, 16 holes 17 and nanoholes, 18 nanotubes 19 and nanobrush or nanolayered 20 as well as targets made of porous silicon, 21 clusters, 22 low-density foam, 23 etc. The intense induced fields in many of these configurations lead to electron heating, guiding, and collimation, [24][25][26][27][28] since the strength and the resulting characteristics of the hot electrons depend on the laser intensity.…”