Bright, directional electron emission from nanowire coated targets under petawatt, femtosecond irradiation

TL;DR

This study demonstrates that nanowire-coated targets under petawatt femtosecond laser irradiation produce bright, directional relativistic electron emission, showing resilience and enhancement compared to flat targets even at high laser contrast levels.

Contribution

The paper provides experimental and simulation evidence that nanowire targets withstand intense laser pre-pulses and enhance relativistic electron emission at petawatt laser facilities.

Findings

Nanowire targets survive high-contrast laser pre-pulses.

Enhanced relativistic electron flux and directionality from nanowires.

Potential for nanowire targets at 10 PW laser facilities.

Abstract

Interactions of relativistically intense laser pulses with structured targets have long been explored for controlling energy absorption and particle acceleration. However, at upcoming multi-petawatt laser facilities, the survivability of such nanostructures under realistic temporal contrast conditions remains a key concern. We report an experimental and simulation study of nanowire targets irradiated by the ELI-NP 1-PW laser without a plasma mirror. At the built in, readily available contrast of $10^{-10}$, the nanowires survive the laser pre-pulse and produce a robust enhancement in relativistic electron flux, energy, and directional emission compared to flat targets indicating that at better contrasts they can show similar enhancement at the 10 PW level. These results establish nanowire targets as resilient and reliable tools for relativistic electron manipulation at state of the art facilities.